Physical Layer | Quizalize

Physical Layer Connectivity and Cable Testing - Starter Quiz

A router is a networking device that forwards data packets between computer networks. Routers perform the traffic directing functions between networks and on the global Internet. Data sent through a network, such as a web page or email, is in the form of data packets. a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. A firewall typically establishes a barrier between a trusted network and an untrusted network, such as the Internet. A modem is a network device that both modulates and demodulates analog carrier signals (called sine waves) for encoding and decoding digital information for processing. A hub is a physical layer networking device which is used to connect multiple devices in a network.

Improving one’s physical appearance is the primary concern, of all people from all walks of life. Not only the party goers, career-oriented, or the celebrities but also ordinary people like us. So one must be careful in choosing the kind of cosmetic products that will not cause any harmful effects to their health as well as the environment. Objectives: Pretest: Home Economics and Livelihood Education 7 Seibo College 43 Cosmetics are products used to beautify, clean or protect the skin, hair, and other parts of the body. Examples of these are make-up, gel, hair spray, and hair dye. Prolong usage of these products will be harmful for your health as well as the environment. What are cosmetics? Cosmetics refer to any preparation intended to beautify the human body, more specifically the face. Make-up preparations – are formulated with covering creams that are skin toned and dense in texture to hide or conceal skin blemishes. Hair spray - is a liquid preparation in an aerosol or other spray container use for holding the hair in place. Home Economics and Livelihood Education 7 Seibo College 44 Hair dye - is a hair coloring matter use to give hair a new color. Gel - a semi rigid or a dispersion of a solid with liquid as in jelly or glue, use to hold the hair in a specific style. Now, take note of the different components commonly found in hair spray. a. Aerosol – is a substance sealed in a container under pressure, with a device for releasing it as a fine spray. Components of aerosol: 1. propane gas - means colorless, flammable gas. 2. butane gas - is the most dangerous substance because it contains carcinogen 3. carcinogen - is a substance that causes cancer. Are you aware of the Global Warming? Do you feel the heat of the sun becoming more intense, especially during summer time? It is due to the continuous depletion of the Ozone Layer. And the depleted ozone layer is caused by aerosol, CFCs (chlorofluorocarbon) and air pollution. The presence of CFCs in the atmosphere can destroy millions of ozone molecules. The destruction of the ozone molecules can cause black hole on the ozone layer which allow the ultraviolet radiation to pass through it down to earth’s surface. Home Economics and Livelihood Education 7 Seibo College 45 Ultraviolet rays coming from the sun penetrates the earth causing us harmful effects. Exposure to the unabsorbed ultraviolet radiation can cause skin cancer. b. CFC - chlorofluorocarbon is a combination of the following components: 1. chlorine - it is a poisonous gas that is highly irritating to the respiratory organ. 2. Fluorine – a toxic gas that occurs with the combination of fluorite, enyolite and other minerals. 3. carbon atoms The above mentioned chemicals do not combine easily with other substances and only vaporize at low temperature. An excessive use may destroy the ozone layer which protects the earth from ultraviolet rays of the sun.

Called igneous rock. Magma is extremely hot-between 700° and 1,300° Celsius (1,292° and 2,372° Fahrenheit). This heat makes magma a very fluid and dynamic substance, able to create new landforms and different environments. engage physical and chemical transformations in a variety of How Magma Forms EX a alamy alam Samy my Earth is divided into three general layers. The core is the superheated center, the mantle is the thick, middle layer, and the crust is the top layer on which we live. Magma originates in the lower part of the Earth's crust and in the upper portion of the mantle. Most of the mantle and crust are solid, so the presence of magma is crucial to understanding the geology and morphology of the mantle. Differences in temperature, pressure, formations in the mantle and crust cause magma to form in different ways. and structural Decompression Melting Decompression melting involves the upward movement of Earth's mostly-solid mantle. This hot material rises to an area of lower pressure through the process of convection. Areas of lower pressure always have a lower melting point than areas of high pressure. This reduction in overlying 10

Living or once-living organisms contribute to weathering, can be a part of both processes. Mechanical Weathering Mechanical weathering, also called physical weathering and disaggregation, causes rocks to crumble. Water, in either liquid or solid form, is often a key agent of mechanical weathering. For instance, liquid water can seep into cracks and crevices in rock. If temperatures drop low enough, the water will freeze. When water freezes, it expands. The ice then works as a wedge. It slowly widens the cracks and splits the rock. When ice melts, liquid water performs the act of erosion by carrying away the tiny rock fragments lost in the split. This specific process (the freeze-thaw cycle) is called frost weathering or cryofracturing. Figure 4.3 Frost Wedging Temperature changes can also contribute to mechanical weathering in a process called thermal stress. Changes in temperature cause rock to expand (with heat) and contract (with cold). As this happens over and over again. the structure of the rock weakens. Over time, it crumbles. Rocky desert landscapes are particularly vulnerable to thermal stress. The outer layer of desert rocks undergo repeated stress as the temperature changes from day Eventually, Lo outer night. layers

1.1 Hardware and software ,Differences between types of operating systems Advantages and disadvantages of the different types of operating systems,Impact on everyday life including Artificial Intelligence (AI),Characteristics, uses, advantages and disadvantages of storage media including magnetic, optical and solid-state,Including: network interface cards (NIC), hubs, bridges, switches,Local Area Network (LAN), Wireless Local Area Network (WLAN), Wide Area Network (WAN) and the differences between these networks,Avoiding password interception by using up to date anti-spyware and regularly changing passwords The differences between strong and weak passwords Other authentication methods Including: zero login, biometric methods, magnetic stripes, smart cards, physical tokens, electronic tokens,Characteristics and uses including newsletters, posters, websites, multimedia presentations, audio, video, media streaming and ePublicationsCharacteristics and effect of threats to data including hacking, phishing, pharming, smishing, vishing, viruses, malware, card fraudLocate stored files Open and import files of different types Save files in a planned hierarchical directory/folder structure Save files using appropriate file names Save and print files in a variety of formats including a document, screenshots, database reports, data tables, graphs/charts, a web page in browser view, a web page in HTML view Use HTML in the content layer Notes and Guidance Create the content layer of a web page

Weathering describes the breaking down or dissolving of rocks and minerals on the surface of the Earth. Water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. Once a rock has been broken down, a process called erosion transports the bits of rock and mineral away. No rock on Earth is hard enough to resist the forces of weathering and erosion. Together, these processes carved landmarks such as the Grand Canyon, in the U.S. state of Arizona. This massive canyon is 446 kilometers (277 miles) long, as much as 29 kilometers (18 miles) wide, and 1,600 meters (1 mile) deep. Weathering and erosion constantly change the rocky landscape of Earth. Weathering wears away exposed surfaces over time. The length of exposure often contributes to how vulnerable a rock is to weathering. Rocks, such as lavas, that are quickly buried beneath other rocks are less vulnerable to weathering and erosion than rocks that are exposed to agents such as wind and water, As it smoothes rough, sharp rock surfaces, weathering is often the first step in the production of soils. Tiny bits of weathered minerals mix with plants, animal remains, fungi, bacteria, and other organisms. A single type of weathered rock often produces infertile soil, while weathered materials from a collection of rocks is richer in mineral diversity and contributes to more fertile soil. Soils types associated with a mixture of weathered rock include glacial till, loess, and alluvial sediments. Weathering is often divided into the processes of mechanical weathering and chemical weathering. Biological weathering, in whichliving or once-living organisms contribute to weathering, can be a part of both processes. Mechanical Weathering Mechanical weathering, also called physical weathering and disaggregation, causes rocks to crumble. Water, in either liquid or solid form, is often a key agent of mechanical weathering. For instance, liquid water can seep into cracks and crevices in rock. If temperatures drop low enough, the water will freeze. When water freezes, it expands. The ice then works as a wedge. It slowly widens the cracks and splits the rock. When ice melts, liquid water performs the act of erosion by carrying away the tiny rock fragments lost in the split. This specific process (the freeze-thaw cycle) is called frost weathering or cryofracturing. Figure 4.3 Frost Wedging Temperature changes can also contribute to mechanical weathering in a process called thermal stress. Changes in temperature cause rock to expand (with heat) and contract (with cold). As this happens over and over again. the structure of the rock weakens. Over time, it crumbles. Rocky desert landscapes are particularly vulnerable to thermal stress. The outer layer of desert rocks undergo repeated stress as the temperature changes from day Eventually, Lo outer night. layersflake off in thin sheets, a process called exfoliation. Exfoliation contributes to the formation of bornhardts, one of the most dramatic features in landscapes formed by weathering and erosion. Bornhardts are tall, domed, isolated rocks often found areas. in tropical Sugarloaf Mountain, an iconic landmark in Rio de Janeiro, Brazil, is bornhardt. a Salt also works to weather rock in a process called haloclasty. Saltwater sometimes gets into the cracks and pores of rock. If the saltwater evaporates, salt crystals are left behind. As the crystals grow, they put pressure on the rock, slowly breaking it apart. Plants and animals can be agents of mechanical weathering. The seed of a tree may sprout in soil that has collected in a cracked rock. As the roots grow, they widen the cracks, eventually breaking the rock into pieces. Over time, trees can break apart even large rocks. Even small plants, such as mosses, can enlarge tiny cracks as they grow. Animals that tunnel underground, such as moles and prairie dogs, also work to break apart rock and soil. Other animals dig and trample rock aboveground, causing rock to slowly crumble. Chemical Weathering Chemical weathering changes the molecular structure of rocks and soil.For instance, carbon dioxide from the air or soil sometimes combines with water in a process called carbonation. This produces a weak acid, called carbonic acid, that can dissolve rock. Carbonic acid is especially effective at dissolving limestone. When carbonic acid seeps through limestone underground, it can open up huge cracks or hollow out vast networks of caves. Carlsbad Caverns National Park, in the U.S. state of New Mexico, includes more than 119 limestone caves created by weathering and erosion. The largest is called the Big Room.. With an area of about 33,210 square meters (357,469 square feet), the Big Room is the size of six football fields. Another type of chemical weathering works on rocks that contain iron. These rocks turn to rust in a process called oxidation. Rust is a compound created by the interaction of oxygen and iron in the presence of water. As rust expands, it weakens rock and helps break it apart. Another familiar form of chemical weathering is hydrolysis. In the process of hydrolysis, a new solution (a mixture of two or more substances) is formed as chemicals in rock interact with water. In many rocks, for example, sodium minerals interact with water to form a saltwater solution. Hydration and hydrolysis contribute to flared slopes, another dramatic example of a landscape formed by weathering and erosion. Flared slopes are sometimes nicknamed "wave rocks." Their c-shape is largely concave rock formations a result of subsurface weathering, in which hydration and hydrolysis wear away rocks beneath the landscape's surfaceWeathering and People Weathering is a natural process, but human activities can speed it up. For example, certain kinds of air pollution increase the rate of weathering Burning coal, natural and petroleum releases chemicals such as nitrogen oxide and gas, sulfur dioxide into the atmosphere. When these chemicals combine with sunlight and moisture, they change into acids. They then fall back to Earth as acid rain. Acid rain rapidly weathers limestone, marble, and other kinds of stone. The effects of acid rain can often be seen on gravestones, making names and other inscriptions impossible to read. Acid rain has also damaged many historic buildings and monuments. For example, at 71 meters (233 feet) tall, the Leshan Giant Buddha at Mount Emei, China is the world's largest statue of the Buddha. It was carved 1,300 years ago and sat unharmed for centuries. An innovative drainage system mitigates the natural process of erosion But in recent years, acid rain has turned the statue's nose black and made some of its hair crumble and fall.

Related quizzes

Related quizzes