Power hour 41 Earth Rocks!

How many groups of rocks does the passage name?

• A. one

• B. three

• C. two

What does the author describe in the passage?

• A. why there are only three different rock groups

• B. which group of rocks is the most common on Earth

• C. how different groups of rocks are made

Metamorphic rocks are rocks that were previously a different type of rock. What evidence from the passage supports this conclusion?

• A. Metamorphic rocks start as igneous or sedimentary rocks.

• B. A metamorphosis is a kind of change that something undergoes.

• C. Examples of metamorphic rocks are slate and marble.

. Read the following sentences: "Sedimentary rocks begin as sediment at the bottom of rivers, lakes, and oceans. Sediment is made of small pieces of sand, clay, and shells. The weight of water presses down on the sediment until it becomes hard." Based on this information, what can you conclude about sedimentary rocks?

• A. Some sedimentary rocks have shells in them.

• B. All sedimentary rocks are found far from water.

• C. Sedimentary rocks are harder than igneous rocks

What is this passage mostly about?

• A. sedimentary, igneous, and metamorphic rocks

• B. rocks that are created from lava or magma

• C. rocks that are created from sediment

Read the following sentences: "When magma cools and hardens, igneous rock forms. Igneous rock also forms when lava cools. Lava is magma that erupts from a volcano." As used in this sentence, what does the word "erupts" mean?

• A. slowly drips

• B. comes out

• C. buries something

Choose the answer that best completes the sentence below. Metamorphic rocks form ___________ heat and heavy pressure cause igneous or sedimentary rocks to undergo metamorphosis.

• A. but

• B. because

• C. so

What are sedimentary rocks made from?

How are igneous rocks created?

What role does heat play in the formation of rocks?