Earth & Space: Ch 3 Review

The super continent that existed about 300 million years ago

Pieces of lithosphere moving around on the asthenosphere

The theory that states Earth's plates are always in motion because of convection currents

An area where two plates are slipping past each other, side by side

The idea that continents slowly move across Earth's surface

Deep valleys formed along divergent boundaries

Which of the following is not a piece of evidence used to support sea-floor spreading?

_______ is formed where the ocean floor sinks back into the mantle after hitting a landmass.

Pangaea is the only super continent that has ever existed.

Breaks in Earth's crust along plate boundaries

Mountains are most likely to occur at _____ boundary.

Mountain ranges running along the middle of the ocean floor

Volcanoes are most like to form at ______ boundary.

Mid-ocean ridges form from

Earthquakes are most likely to occur at _____ boundary.

Who was responsible for the idea of continental drift?

The process of new material being added at mid-ocean ridges and pushing older material away

An area where two plates are moving away from each other

An area where two plates are moving toward each other

Subduction and sea-floor spreading change the ocean floor by ________________.

Approximately how much do plates move each year?

Which of the following did NOT support Wegener's idea?

The process in which the ocean floor sinks down into the mantle