Test #5

Study of earthquakes:

The temperature of rocks decrease with depth.

The point underground where an earthquake begins is called the ______.

The boundary between the earth's crust and its mantle:

The process by which new soil is formed as rocks crumble and break into smaller pieces:

Holes or crack which serve as escape vents for underground gases:

This volcano is formed from large amounts of very fluid lava that built up gradually; Hawaiian islands is an example.

Scientists who study the structure of the earth:

A magma chamber is created when trapped gases blast through the earth's surface.

A volcano that has been active at some time in recorded history, but has not had a recent eruption:

Magma that has reached the earth's surface:

The place at ground level that is directly above the focus of an earthquake is known as the ____.

Earthquakes sometimes cause monsterous waves called _____.

The strength of an earthquake is called its magnitude.

A volcano that has not erupted in recorded history:

Underwater mountain ranges:

A volcano characterized by hot clouds of gas and dust that it expels:

A volcano allows molten rock and hot gases to escape from within the earth.

A break that appears at the boundary between two moving masses of rock is known as a(n) ______.

Small fragments of molten rock that solidify almost instantly:

This volcano is alternating layers of tephra and lava; Mt. St. Helen is an example.

This volcano is formed by eruptions of mostly tephra and very little lava; Paricutin is an example.

A volcano that has erupted recently:

Any trmebling or shaking of the earth's crust is defined as an _____.

Running along the edge of the Pacific Ocean, the _____ is named for its many volcanoes.

A depression found at the top of a volcano:

Chemical weathering occurs when natural acids slowly eat into a rock, breaking it apart.

A volcano that produces lava fountains or fire curtains: