4th Grade Unit C Ch. 1 Earthquakes and Volcanoes

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ocean-floor crust

Some volcanoes form new ___________ as plates move apart and magma rises to the surface of the crust.

inner core

Earth's ________ is its hottest layer.

measure

Scientist can __________ earthquakes by using seismographs, the Mercalli scale, and the Richter scale.

fault

California has more than 20,000 earthquakes each year, because there is a large ___________ running through the state.

do not

All eruptions _______ form the same kinds of volcanic mountains because the shape of a volcano depends on what type of materials it erupts. There are different eruptions for different volcanoes.

mantle

Earth's plates move very slowly across Earth's surface on a thin layer of partly melted _________.

layers

The inner core, the outer core, the mantle, and the crust are the _______ of the Earth.

magnitude

The 1964 Alaska earthquake released more energy than the 1989 California earthquake as measured by the ____________ (size of waves) and the intensity using a Richter scale.

mountains

If Earth's plates stopped moving, then the Earth's core would cool and no new mountains would form. Then rain would erode the Earth's surface until it was flat and covered with water.

Ring of Fire

The _____________ is an area with frequent earthquakes and volcanic eruptions that circles the Pacific Ocean.

focus

_________ is the point underground where the movement of an earthquake first took place.

magma

________ is the melted rock inside the Earth.

lava

________ is the melted rock that reaches Earth's surface.

epicenter

________ is the point on the surface of Earth that is right above the focus of an earthquake.

vent

__________ is the rocky tube in a volcano through which magma rises toward the surface.

seismograph

_________ is an instrument that records earthquake waves.

magma chamber

_________ is an underground pool below a volcano that holds magma.

volcano

________ is a mountain that forms when red-hot melted rock flows through a crack onto Earth's surface.

crater

________ is a large basin formed at the top of a volcano when the top falls in on itself.

crust

_______ is the Earth's outer layer and includes the rock of the ocean floor and large areas of land.

mantle

________ is the thickest layer of Earth and is found just below the crust.

fault

_______ is a break in the Earth's crust along which rocks move.

earthquake

_______ is a vibration, or shaking, of the Earth's crust.

plate

_______ is a continent-sized slab of Earth's crust and upper mantle.

core

_______ is the dense center of the Earth and is a ball made mostly of two metals (iron and nickel).

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