Earth's Structure & Processes

In what direction do seismic waves carry the energy of an earthquake?

_____ is the force that squeezes rocks together.

A lack of explanation for cont. drift prevented scientists from accepting the supercontinent

The type of seismic waves that arrive at the surface first and are compressional waves are

A person twice as far from an epicenter will notice the time between the arrival of P & S waves

Along a(n) ____ fault, the hanging wall moves downward in relation to the foot wall.

____ faults are caused by compressional forces.

Which type of evidence was NOT used by Wegener to support his continental drift hypothesis?

A ____ forms where two oceanic plates collide

A collision between two pieces of continental lithosphere at a converging boundary produces a

_____ is the force that pulls rocks apart.

Scientists believe that differences in ______ cause hot, plasticlike rock in the mantle to rise

Along a(n) ____ fault, the hanging wall moves upward in relation to the foot wall.

Active volcanoes are most likely to form at

Plates of the lithosphere float on the

The process by which the ocean floor sinks beneath a trench and back into the mantle is

Most geologists rejected Wegener's idea of continental drift because

At a(n) ____ fault, rocks on either side of the fault surface move past each other.

Old oceanic crust is more dense than new oceanic crust because it is

Most geologists think that the movement of Earth's plates is caused by

Secondary waves ___ when they hit the liquid outer core.

____ are formed when two continental plates collide

Compared to P waves and S wave, surface waves move

Primary waves ___ when they hit the liquid outer core.

In order to complete a convection current, the rising material must eventually _____ Earth

Bands of rock on the seafloor alternating magnetic orientation indicates the magnetic field

Seafloor spreading occurs because

The youngest rocks on the ocean floor are located where?

The point beneath Earth's surface where rock breaks under stress and triggers an earthquake is

The most destructive seismic waves are

What type of earthquake wave can travel through both liquids and solids?

When the force on rocks is great enough, they break, producing vibrations called

____ faults are caused by tensional forces.

At least ____ seismographs are needed to accurately locate an earthquake epicenter

Scientists think that convection currents flow in Earth's

Scientists discovered changes in Earth's interior by studying

Plates slide past one another at

Once the elastic limit of rocks is passed, they break and move along surfaces called

____ is the force that causes plates to move sideways past each other.

_____ faults are caused by shear forces.

The crust and upper mantle make up Earth's

What is the correct order (starting from the surface) of Earth's layers?