longitudinal earthquake wave that is the first wave to reach the surface

seismic wave that travels along the Earth's surface

the secondary wave that can't travel through liquids

origin of an earthquake

sudden shaking of the ground due to movement along a fault

instrument used to record intensity, direction and duration of an earthquake

point on Earth's surface above the focus of an earthquake

What is a fault?

To find the epicenter of an earthquake, what is the minimum number seismic stations that are needed?

Region with the greatest amount of earthquake activity

Instrument that records earthquakes

Rigid layer of Earth that includes the entire crust and the uppermost part of the mantle

Characteristics of P and S waves

The asthenosphere is located

P waves ____________.

fracture in a rock formation

The particles produced in volcanic eruptions are called

the broad, slightly dome shaped volcanoes of Hawaii are

Type of volcano that is fairly symmetrical and has both layers of lava and pyroclastic deposits.

a large volcanic crater, especially one formed by a major eruption leading to the collapse of the mouth of the volcano.

Name 3 things that affect how violently a volcano erupts.

Structures that form from the cooling and hardening of magma beneath Earth's surface

Type of intrusive feature forms when magma is injected into fractures cutting across preexisting rock layers.

Magma tends to rise towards earth's surface primarily because?

Large particles of hardened lava ejected from a volcano are called?

What factors help determine whether a volcanic eruption will be violent or relatively quiet?

Fluid basaltic lavas, like those in Hawaii, commonly form

A lava flow with a surface of rough, jagged blocks and sharp, angular projections is called what type of low?

A magma's viscosity is directly related to its

As the temperature of lava increases, ____.

piece of semi-molten rock ejected as glowing lava