Bio Unit 1 Quiz

The earth recycles crust through subduction

the process by which molten material adds new oceanic crust to the ocean floor

the hypothesis that the continents slowly move across Earth's surface

Cyanobacteria is important because

Which event occurred first?

Evidence of seafloor spreading

Older crust is recycled.

Scientist who proposed the crust of the earth is broken into separate plates

Scientist who determined that the continents were once joined together in a single landmass

supercontinent

Older crust....

Newer crust....

Newer crust.....

New crust is added in the middle of continents

a theory stating that the earth's surface is broken into plates that move

Earth's EARLY atmosphere was mostly oxygen

Scientist who proposed seafloor spreading.

Length of time required for half of the radioactive atoms in a sample to decay

Evidence Wegener used to support his hypothesis

dating using decay of radioactive isotopes