Plate Tectonics

Front

The lithosphere (crust) is broken into sections called

Back

plates

Front

What process creates new crust from magma?

Back

sea-floor spreading

Front

Where would you find the oldest rocks on the ocean floor?

Back

near the trench

Front

What is one piece of evidence for sea-floor spreading?

Back

magnetic stripes on the ocean floor

Front

Which type of boundary forms a mid-ocean ridge?

Back

divergent

Front

What evidence did Alfred Wegener use to support his theory of continental drift?

Back

Fossil discoveries

Front

What is true of tectonics plates?

Back

They are constantly moving

Front

What is the underlying force that drives plate tectonics?

Back

Convention currents

Front

What is true of Earth's landmasses?

Back

They are the upper part of the crust

Front

What is a tectonic plate?

Back

broken pieces of lithosphere floating on the asthenosphere