main idea

Front

What is sandstone made of?

Back

Sandstone is made of sand that dried over time.

Front

What type of rock is eroded by water and wind?

Back

Igneous rock is eroded by water and wind.

Front

What was the Grand Canyon before it was sandstone?

Back

The Grand Canyon was once sand.

Front

What holds down metamorphic rock in the Earth?

Back

Bigger rocks hold down metamorphic rock in the Earth.

Front

How are igneous rocks formed?

Back

Igneous rocks are formed from magma that becomes lava.

Front

What is erosion?

Back

Erosion is the process by which water, wind, or ice wears away rocks and soil.

Front

What are the three main types of rocks?

Back

The three main types of rocks are igneous, sedimentary, and metamorphic.

Front

What is magma?

Back

Magma is molten rock located beneath the Earth's surface.

Front

What is lava?

Back

Lava is molten rock that has erupted onto the Earth's surface.

Front

What is sediment?

Back

Sediment is small particles of rock and soil that are carried by water or wind.