Fast Land Changes

What happens during a landslide?

• A. Magma moves up from the mantle and erupts.

• B. Large pieces of land break off and slide down.

• C. The ground freezes and melts when it's warmer.

• D. Water in streams and rivers overflows the banks.

Why can floods be helpful?

• A. They form new islands in the oceans.

• B. They make Earth's mantle stronger.

• C. They damage many roads and homes.

• D. They can bring rich soil to an area.

What is melted rock from the mantle called after it has erupted from a volcano and reached the surface?

• A. plate

• B. magma

• C. lava

• D. crust

What can cause earthquakes?

• A. Heavy rains make rivers overflow their banks.

• B. Tectonic plates push and slip past each other.

• C. Strong winds can push apart pieces of land.

• D. Waves travel across the seas and break on land.

Many volcanoes are EXTINCT and will never erupt. Which word is similar to EXTINCT?

• A. alive

• B. dead

• C. warm

• D. lava

Which sentence about volcanoes is FALSE?

• A. Volcanoes give rich soil that is good for farming.

• B. Volcanoes can erupt and lava can form islands.

• C. Volcanoes can spit out ash, molten rock, and gases.

• D. Volcanoes are all active and can erupt at any time.

Both magma and lava are molten rocks. How are they different?

• A. Lava is very cold and hard, and magma is very hot.

• B. Magma is underground, and lava is on the surface.

• C. Lava flows to the mantle, and magma flows to the crust.

• D. Magma can cool to form hills, but lava cannot form hills.

What happens first?

• A. The wave travels across the sea and gets bigger.

• B. The earthquake causes a big wave to form.

• C. An earthquake occurs in the middle of the sea.

• D. A big wave hits a coast and causes flooding.

Which sentence about tectonic plates is TRUE?

• A. They lie on top of all the continents and the oceans.

• B. Earthquakes happen when they slip against each other.

• C. There are five major tectonic plates and two minor ones.

• D. The tectonic plates are part of the Earth's center core.

Sometimes during a storm, water can rise up very quickly and cause a flood. What do you think this type of flood is called?

• A. gradual flood

• B. flash flood

• C. lazy flood

• D. wet flood