Why are head and spine injuries much more serious than muscle strain or hematomas? a. head and spine injuries can result in permanent disabilities. b. muscle strain can result in long-term health problems. c. spine injuries are generally quick to recover from. d. they require moving the athlete off the playing field immediately.

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?