Lesson 4 Landforms and the earth's changes

A ______ is a break or crack in rocks where Earth's crust can move suddenly.

• fault

• drought

• flood

• explosion

A ___________ is a period of unusually low rain or snowfall.

• fault

• drought

• flood

• avalanche

A __________ is water covering normally dry land.

• fault

• flood

• drought

• fog

Slow-moving rocks along a fault can get stuck. What can they cause when they suddenly move?

• volcano

• earthquake

• weathering

• drought

What happens when a volcano erupts?

• Magma reaches Earth's surface.

• Earth's plates move suddenly.

• Rocks around a fault suddenly move.

• Earth's surface changes slowly.

Earth is made up of ________ layers.

• one

• three

• four

• six

True or False: Earth’s crust is one solid piece.

• True

• False

Volcanic eruptions are caused by

• gravity

• pressure

• explosions

• Earth's rotation

Where do volcanoes usually form?

• within 10 miles of the ocean

• between Earth’s mantle and core

• at fault lines between tectonic plates

• within the boundaries of the United States

Magma is made up of ________ from the mantle mixed with hot gas.

• lava

• plasma

• molten rock

• hot water