James blows up a balloon as a demonstration in class. Which sentence explains what he is trying to show his class?

Danea has a mixture of two solids. One is white and is tiny crystals. The other solid is black and is tiny flakes. She pours water on them. The white solid disappears, and the black solid floats to the top of the water. Which two materials did Danea most likely mix together?

Lily is studying how matter changes during reactions. She wants to compare the weight of her materials before and after the reaction. Which tool should she use?

Water particles can be close together or far apart. In which of these examples are the water particles closest together?

Manny poured150 milliliters (mL) of water into a beaker. He found that the weight of the water was 150 grams (g). Then, Manny added 20 g of sugar to the water. He heated the water but did not boil it. As he heated the water, he stirred until all of the sugar crystals dissolved. What was the weight of the mixture after all of the sugar dissolved?

A student added a scoop of sugar to a cup of water. Then she stirred the sugar and water for one minute. The drawing shows what the student observed in the cup before and after stirring.

Which statement best explains what happened to the sugar after stirring?

What is the process that plants use to produce food?

What is a habitat?

All living things need certain things to live and grow. Which of these things do all living things need to survive?

In a grassland food chain, grasshoppers eat grass. Then meerkats eat grasshoppers. What is the main role of the grasshopper in this food chain?

In a food chain, there are producers, consumers, and decomposers. What is the role of a producer in a food chain?

Which organism is a producer?

What makes up an ecosystem?

Dara is studying why animals need food. He made a list of what he thought were reasons. Which reason should be removed from Dara’s list?

What can plants do that animals cannot do?

A student setup an investigation with four plants of the same kind. Plant 1 gets light and water. Plant 2 gets light but no water. Plant 3 gets water but no light. Plant4 gets no water and no light. What will happen to the plants?

Gail puts a green plant in a closed wooden box. She gives it good soil and plenty of water. What will happen to the plant?

Which human activity helps protect human resources?

Some things need to betaken to a landfill. Many landfills have liners and covers. The liners are made of plastic or thick clay or concrete. After many years, the trash in the landfill will decompose. Some types of trash decompose quickly while others, like a glass bottle, can take 100 years to decompose. How do the liners and covers help to protect the environment?

Building highways impacts the environment. One national park in Canada is trying to lessen the impact. Park employees built 8-foot-tall fences along the highway. They also built 22 tunnels under the highway and large land bridges over the highway. How are these changes likely to help the environment?

Veronica lives in a city that has started a composting and recycling program. She is not sure which objects to put in which bin. Which source would be the most reliable for determining which objects to put in which bin?

Making pavement uses chemicals that can be dangerous to the air. It also covers the ground so that water runs off instead of soaking down into the ground. Some cities are using sediments and small rocks instead of pavement. In which way does this most help the environment?

Sampson is researching an environmental topic for school. He reads these books and articles:

●       Planting on Your Roof and Walls

●       Ecosystems Up High

●       How to Construct and Maintain a Sturdy Roof

●       Living Houses Help the Environment

Most scientists are worried about the environment. They gather the following information:

●       the number of trees cut down each year

●       the number of trees burned each year

●       the levels of carbon dioxide on Earth

●       the levels of oxygen on Earth

Kumar has a collection of rocks. He knows that some rocks have a mineral called calcite in them. When calcite and vinegar are mixed, gas is made. Kumar puts each rock in a cup full of vinegar. He notices that some cups have lots of bubbles, some have a few bubbles, and some have no bubbles. How does Kumar know how much calcite is in the rocks?