What occurs when two tectonic plates collide?

Folded mountain ranges are formed.

The plates move away from each other.

Volcanic eruptions occur immediately.

Deep-ocean trenches are created.

What can cause melting in the mantle at a convergent boundary?

Collision of similar density plates

What natural feature forms along a mid-ocean ridge?

Molten material rises from the mantle

Plates collide creating mountains

What occurs at a convergent boundary?

Tectonic plates move toward each other.

Tectonic plates slide past each other.

There is no movement of tectonic plates.

Tectonic plates move away from each other.

In the context of subduction, what happens to the denser oceanic plate?

It is forced beneath a less dense plate.

It rises above the less dense plate.

What is the process of sea-floor spreading?

The creation of new ocean floor as plates move apart.

The collision of tectonic plates.

The destruction of oceanic crust.

What happens at a deep-ocean trench?

An oceanic plate subducts beneath another plate.

Continental plates collide and create mountains.

Plates diverge and create new crust.

Plates are stationary and do not interact.

Which tectonic process leads to the formation of the Himalayan mountain range?

Collision of continental plates.

What do tectonic plates consist of?

both continental and oceanic crust

How do oceanic crust and continental crust differ in terms of density?

Oceanic crust is thinner and denser than continental crust.

Oceanic crust is thinner and lighter than continental crust.

Oceanic crust is thicker and lighter than continental crust.

Oceanic crust is thicker and denser than continental crust.

What defines a convection current?

the transfer of energy by the movement of matter

the transfer of energy from a region of lower temperature to a region of higher temperature

the transfer of energy through a solid, such as the Earth’s crust

the transfer of energy by direct contact

According to Wegener's hypothesis, what happened to the continents?

the continents were once joined together in a single landmass

Earth is slowly cooling and shrinking.

Earth’s surface is made up of seven major landmasses.

Shaping Earth surface

Shaping Earth’s Surface

Shaping the Surface Quiz Review #1 (Shaping Earth's Crust)

Lesson 2: Plate Tectonics There are a few handfuls of major plates and dozens of smaller, or minor, plates. Six of the majors are named for the continents embedded within them, such as the North American, African, and Antarctic plates. Though smaller in size, the minors are no less important when it comes to shaping the Earth. The tiny Juan de Fuca plate is largely responsible for the volcanoes that dot the Pacific Northwest of the United States. The plates make up Earth's outer shell, called the lithosphere. (This includes the crust and uppermost part of the mantle.) Churning currents in the molten rocks below propel them along like a jumble of conveyor belts in disrepair. Most geologic activity stems from the interplay where the plates meet or divide. The movement of the plates creates three types of tectonic boundaries: convergent, where plates move into one another; divergent, where plates move apart; and transform, where plates move sideways in relation to each other. They move at a rate of one to two inches (three to five centimeters) per year. Convergent BoundariesWhere plates serving landmasses collide, the crust crumples and buckles into mountain ranges. India and Asia crashed about 55 million years ago, slowly giving rise to the Himalaya, the highest mountain system on Earth. As the mash-up continues, the mountains get higher. Mount Everest, the highest point on Earth, may be a tiny bit taller tomorrow than it is today. These convergent boundaries also occur where a plate of ocean dives, in a process called subduction, under a landmass. As the overlying plate lifts up, it also forms mountain ranges. In addition, the diving plate melts and is often spewed out in volcanic eruptions such as those that formed some of the mountains in the Andes of South America. At ocean-ocean convergences, one plate usually dives beneath the other, forming deep trenches like the Mariana Trench in the North Pacific Ocean, the deepest point on Earth. These types of collisions can also lead to underwater volcanoes that eventually build up into island arcs like Japan. Divergent Boundaries At divergent boundaries in the oceans, magma from deep in the Earth's mantle rises toward the surface and pushes apart two or more plates. Mountains and volcanoes rise along the seam. The process renews the ocean floor and widens the giant basins. A single mid-ocean ridge system connects the world's oceans, making the ridge the longest mountain range in the world. On land, giant troughs such as the Great Rift Valley in Africa form where plates are tugged apart. If the plates there continue to diverge, millions of years from now eastern Africa will split from the continent to form a new landmass. A mid-ocean ridge would then mark the boundary between the plates. Transform Boundaries The San Andreas Fault in California is an example of a transform boundary, where two plates grind past each other along what are called strike-slip faults. These boundaries don't produce spectacular features like mountains or oceans, but the halting motion often triggers large earthquakes, such as the 1906 one that devastated San Francisco.

1. What is the Earth's thickest layer? A) Crust C) Outer core B) Mantle D) Inner core 2. What is the condition required for a typhoon to form? A) High vertical wind shear C) Presence of a pre-existing disturbance B) Low sea surface temperatures D) Thick mantle layer 3. A liquid layer that surrounds the inner core. Made up of iron and nickel. A) Outer Core C) Upper Mantle B) Lower Mantle D) Lower Mantle 4. What is the name for a fold that is curved upwards? A) Syncline C) Anticline B) Monocline D) None of the above 5. What is the point on the Earth's surface directly above the focus of an earthquake? A) Seismograph C) Epicenter B) Seismogram D) Focus 6. Which seismic waves can travel through solids, liquids, and gases? A) P waves C) Love waves B) S waves D) Rayleigh waves 7. What term describes the calm center of a typhoon? A) Eyewall C) Tropical storm B) Super typhoon D) Eye 8. What is the Philippine government agency responsible for monitoring and forecasting tropical cyclones? A) PAGASA C) PAR B) PSWS D) NOAA 9. Approximately how many typhoons can enter the Philippine Area of Responsibility per year? A) 10 C) 30 B) 20 D) 40 10. What is the best way to do during an earthquake? A. I will run outside to get away from the shaking. B. I will stay indoors and take cover under a sturdy table or desk. C. I will get under a doorway or in a corner. D. I will stay in my bed and hold on to the headboard.

Geologic Processes. Where do geologic hazards usually occur? From the previous chapter, it has been discussed that the surface of Earth is made up of lithospheric plates that are moving on top of the asthenosphere. These movements along the different kinds of plate boundaries are the cause of the natural geologic phenomena such as earthquakes and volcanic eruptions. Earthquakes An earthquake is the minimal to rapid shaking of the ground due to the movement of rocks along fractures, known as faults, on Earth's surface. These faults are usually associated with the parallel movement of plates in a transform fault. As the plates move, rock deformation occurs and energy starts to build up. When the rocks break, energy is released, resulting in an earthquake. The Philippines is prone to earthquakes because of the numerous faults within the country. Therefore, it is already given that the Philippines would experience a lot of geologic hazards.

What is an earthquake? Would you be surprised to learn that several million earthquakes happen every year? Seriously. Most are so small in magnitude or size that we cannot even feel them. In fact, only 20 earthquakes are efficiently reported each year in the United States Geological Survey. Wow! That is a huge difference! The Earth has four major layers. Inner core, outer core, mantle, and crust. Think of the crust and top of the mantle like the skin of the earth. This skin is made up of different pieces of rock called tectonic plates. There are about 15 major slabs that join together, kind of like a puzzle. The edges around the tectonic plates are called plate boundaries. These massive pieces of rock slide back and forth under the Earth's surface, bumping up against each other and creating a lot of tension. This tension and movement create faults, which are basically huge cracks in the rock. When the faults get stuck, they build up pressure. And when they get unstuck, you guessed it, an earthquake. So basically, an earthquake is caused by the shifting and sliding of tectonic plates on the Earth's upper mantle and crust. There are three ways that tectonic plates shift or slide. They are subduction, lateral sliding, and spreading. Subduction happens when plates crash into each other. This can cause one plate to slide under another and be destroyed. Or the edges of the plate may rise up and form mountains. Lateral sliding means that the plates slide alongside each other, which can create lots of friction. And like you might have guessed, spreading happens when plates move apart from each other. When they do, melted rock between the plates rises and cools, forming new crust. Here's an interesting fact. Nearly 90% of all earthquakes begin in the Pacific Ocean, in an area called the Ring of Fire. It's called the Ring of Fire because along with earthquakes, it's filled with many active volcanoes. More than 450! Earthquakes can be powerful enough to change the surface of the earth and can do a lot of damage. And sometimes earthquakes can even cause other natural disasters, like avalanches, landslides, and tsunamis. Pretty wild, right? The epicenter is the location of an earthquake on the Earth's surface. The closer you are to the epicenter, the more of the earthquake you will feel. Earthquakes lose intensity as they travel away from the epicenter. Scientists measure the intensity of an earthquake using a special device called a seismograph. Seismometers detect and measure the vibrations given off by an earthquake. Magnitude is the number given to record the size of an earthquake. For example, a magnitude 5.5 is considered moderate. Above 8.0 is considered a major earthquake and we see one every year or two. Earthquakes measured at 2.5 or less are usually not felt, but can be recorded. And believe it or not, there are millions that happen each year. You can make a model of a seismograph at home, and we are going to show you how. It's activity time! You can print off directions for this one on our website at learnbright.org. You'll need a cardboard box, string, a plastic cup, a marker, small heavy objects, a long strip of paper, and a friend because this is an activity for at least two people. Now comes the fun part. One friend shakes the box, alternating between hard and soft and slow and fast, while the other friend is pulling the strip of paper through the bottom. Watch the marker as it records the movement. This is exactly what a seismograph does during an earthquake. So, in a way, we have not only created our own seismograph, but our own earthquake as well. Now, we can analyze the data just like scientists. Can you tell how hard the box was shaking based on the line? Can you tell when it was barely shaking at all? You are on your way to becoming a seismologist. A seismologist is a person that studies earthquakes. It's pretty cool to watch the process, but it's even more exciting to do it yourself. You can head on over to our website to get detailed instructions for this activity. Just download the lesson plan and as always have fun! Hope you had fun learning with us! Visit us at learnbright.org for thousands of Hope you had fun learning with us! Visit us at learnbright.org for thousands of free resources and turnkey solutions for teachers and homeschoolers.

Sharks Introduction. Sharks have lived in the oceans since before dinosaurs walked on Earth. Hundreds of kinds of sharks can be found all over the world. Sharks are fish, but their skeletons are made of cartilage instead of bones. Cartilage is what gives human ears their shape. Unlike most fish, sharks have rough skin. Sharks have a good sense of smell. They also see well in the dark. Sharks can sense other animals moving in the water. Description. Great white shark come in many sizes. Some sharks are only a few inches long. The huge whale shark is the largest fish in the world. Many sharks are dark on the top and light on the bottom. This shading makes it harder for other animals to see them. Sharks swim by swinging their tails from side to side. Fins help sharks steer, turn, and keep their balance. Eating. Most sharks have many rows of teeth. When one tooth breaks off, another one moves up to take its place. Most sharks eat fish. Large sharks eat sea lions, dolphins, and other sharks. Some sharks eat shellfish. These sharks have flat teeth for crushing shells. The huge whale shark has tiny teeth but doesn't use them when eating. It swallows very small ocean plants and animals that float near the ocean's surface. Shark Attacks. Many people are afraid of sharks, but most sharks do not attack humans. Great white sharks are one of the few kinds of sharks that are dangerous to people. Shark Hunting. Shark fishing boats. People hunt sharks for their skin, oil, and teeth. Many people eat shark meat, and shark fins are used to make soup. Many kinds of sharks are now in danger of being completely killed off. Sharks are an important part of the balance of life in the world's oceans. They have as much right to live as any other animal.

Related quizzes

Related quizzes