Plate Tectonics (8th Grade)

In sea-floor spreading, molten material rises from the mantle and erupts

When continental plates pull apart at a divergent boundary on land, a(n) _____________ forms.

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

A place where two plates slip past each other, moving in opposite directions, is known as a ____________.

The hypothesis of __________ was that all the continents once were joined as a single supercontinent that drifted apart.

Any trace of an ancient organism that has been preserved in rock is called a ___________.

According to Wegener's hypothesis of continental drift,

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

If subduction occurs faster than oceanic crust can be created, an ocean will _____________.

Mid-ocean ridges form the longest mountain ranges on Earth.

The process of _____________ continually adds new crust to the ocean floor along both sides of the mid-ocean ridge.

Oceanic crust near the mid-ocean ridge is older than the oceanic crust farther away from the ridge.

Subduction occurs where the oceanic crust bends down toward the mantle at a _________________.

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

The lithosphere is broken into sections called __________, which float on top of the asthenosphere.

Along a ______________, two plates slip past each other, moving in opposite directions.

The geological theory that states that pieces of Earth's lithosphere are in constant, slow motion is the theory of ____.

What is Pangaea?

What technology did scientists use in the mid-1900s to map the mid-ocean ridge?

Alfred Wegener provided evidence from landforms, fossils, and climate in support of his theory of