U4-M2-L2 Development of a Theory (Plate Tectonics)

Front

What device did scientists use in the late 1940s to map the ocean floor?

Back

Echo sounder

Front

What are the vast mountain ranges deep below the ocean's surface called?

Back

Mid-ocean ridges

Front

What is the process called that creates new oceanic crust along mid-ocean ridges?

Back

Seafloor spreading

Front

What are ocean trenches?

Back

Deep underwater troughs

Front

What theory explains the movement of Earth's surface made of rigid slabs of rocks?

Back

Plate tectonics

Front

Earth's crust is broken up into several large rocky pieces called ...

Back

plates

Front

What is the theory that the lithosphere is divided into plates that are always moving?

Back

Plate tectonics

Front

This scientist built most of the evidence for continental drift.

Back

Alfred Wegener

Front

What is the theory that states that parts of the Earth's crust slowly drift atop a liquid core?

Back

Continental Drift Theory

Front

Shifting pieces of the Earth's crust are called

Back

tectonic plates