Brainlest if you do the ones i have not done

3: Lithosphere

4: Asthenosphere

5. There are 7 Major Plates

6. Divergent Boundaries

7. Convergent Boundaries

8. A fault along a plate boundary where the motion is predominately horizontal.

10. It explains the forming of a new ocean crust / or ocean floor.

Explanation:

they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom