DCA Review

What would be the best explanation if clam fossils were found in rock layers below layers that contain tree fossils?

• A. Trees used to grow in seawater.

• B. Clams were collected by ancient people and used as jewelry.

• C. The area was once a sea, but then it dried up.

• D. Clams used to be land animals, but then they moved to the sea.

The diagram represents some layers of rock. Compare layers B and D. Describe what the environments were like, and tell which one is the oldest and why.

• Layer B is older because it is below layer D, indicating it was deposited first.

• Layer D is older because it is above layer B, indicating it was deposited first.

• Layer B and D are the same age because they are side by side.

• Layer B is older because it contains fossils that are more recent than those in layer D.

What are the missing phases? Choose the correct phases from the options below.

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Fill in the blank: ________ resources have the advantage of providing us with energy and can be replaced in a lifetime. Disadvantage: Bad weather can affect its availability. Examples: Plants, animals, wind, water.

• Renewable

• Non-renewable

• Fossil fuel

• Nuclear

Fill in the blank: ________ resources have the advantage of providing us with energy and are easy to produce. Disadvantage: Cannot be replaced within a lifetime. Examples: Coal, oil, natural gas.

• Non-renewable

• Renewable

• Sustainable

• Inexhaustible

Which moon comes next in the pattern?

• A) A fully lit moon

• B) A moon that is mostly lit up on the right side

• C) A new moon

• D) A moon that is halfway lit up on the left side

Which part of the water cycle diagram above represents water evaporation?

• A) A

• B) B

• C) C

• D) D

Weather is the (a)   conditions in the atmosphere.

• yearly

• daily

• average

• monthly

Which of the following events in the water cycle describes the process of condensation?

• A. Water falls to Earth as freezing rain.

• B. Heat energy changes liquid water to gas.

• C. Water vapor changes to tiny drops of water and forms clouds.

• D. Water flows over Earth’s surface.

Evaporation and condensation are similar because:

• they both involve water changing from a liquid to a gas.

• they both involve water changing from a gas to a liquid.

• they both involve water remaining in the same state.

• they both involve water changing states.