Environmental changes that cause extinction occur on what time scale? O They are instantaneous.
O They can occur over shorter or longer time scales.
O They are always on the scale of hundreds or thousands of years.
O They are usually on the scale of a few years.

How do you think earths interior affects what is happening on the surface? 2. how do fossils support the continental drift hypothesis? 3. how does sea- floor spreading support the hypothesis of continental drift? 4.what do scientists observe when they studied the magnetic fields of rocks on the sides of mid-ocean ridges? 5. what is a tectonic plate ? 6. explain mantle convection 7.how can movements of the continents affect earths climate? 8. what occurs during drifting?