Plate Tectonics Test Review

When magma rises up through the mid-ocean ridge and cools, it forms this rock type?

Magnetic signatures form when minerals in cooling lava line up with Earth's magnetic field.

Alfred Wegener proposed the ____________________ hypothesis.

Evidence to prove continental drift was discussed decades after Wegener's death.

What is the name of Alfred Wegener's ancient supercontinent?

The presence of the same ___ on several continents supports the hypothesis of continental drift

Earth's Inner core causes Earth's magnetic field.

Continental drift states that continents have moved ___to their current location.

As a slab sinks, it pulls on the rest of the plate with a force called?

Rock on the seafloor showing alternating magnetic orientation shows Earth's magnetic field has

Which of the following has become the unifying theory of geology?

Wegener believed that the continents were a part of a supercontinent about _____ years ago

The hypothesis that continents have slowly moved to their current locations is called ____.

The youngest rocks on the ocean floor are located _____.

The theory of plate tectonics provides an explanation for why earthquakes and volcanoes occur

Deposits of _____ in Antartica are evidence of continental drift.

What causes convection in Earth's mantle?

When a magnetic field causes a magnet to point north, the magnetic field has ___.

A fossil plant that helps support the theory of continental drift is ____.

What evidence helped support the theory of seafloor spreading?

The youngest part of the ocean floor is found _____.

When plates collide the plate that is denser goes under the less dense plate in the process of

A vast, underwater mountain chain called a(n) ____.

Glacial grooves are proof that continents with warm climates once had colder climates.

Ocean crust is _______.

Plates tectonics states slabs of rock or plates move with respect to each other.

New crust forms and old oceanic crust moves away from a mid-ocean ridge during ___.

Which pate tectonic process creates deep ocean trenches?

Continental drift was not widely accepted when it was first proposed because _____.

A __ is a sensitive device used to detect magnetic fields on the seafloor.

Fossils provide evidence for continental drift.

Of all Earth's plates, the ____ plate is the largest.

The magnetic pattern of ocean-floor rocks on one side of an ocean ridge is ____.

Seafloor spreading occurs because __________.

If divergent plate boundaries separate parts of a continent, _____ form.

While studying the ocean floor, scientist found ___bands of magnetism.

What causes plate motion?

When plate _____- on the seafloor, mid-ocean ridges form.

Convection currents in the mantle affect the movement of tectonic plates.

Scientists have observed that the continents move apart or come together at speeds of a few cm

The cold and rigid outermost rock layer of the Earth is called the asthenosphere.

What technologies did scientists NOT use to develop the theory of seafloor spreading?