Science

4. Caused by two tectonic plates rubbing together
7. Upper part of the mantle, commonly referred to as the earth’s crust
10. Convection currents occur when a reservoir of fluid is heated at the bottom, and allowed to cool at the top.. Heat causes the fluid to expand, decreasing its density. If there is cooler material on top, it will be more compact and therefore, will sink to the bottom. The heated material will rise to the top.
11. Area of the Earth's mantle from which hot plumes rise upward, forming volcanoes on the overlying crust.
13. Crust, upper mantle, lower mantle, outer core, inner core
15. the formation of new areas of oceanic crust, which occurs through the upwelling of magma at midocean ridges and its subsequent outward movement on either side.

1. Shifting of tectonic plates
2. Sections of the Earths crust, constantly ever so slowly shifting around.
3. Remnents of past life on Earth now turned rock
5. Proposed the idea of seafloor spreading around the ocean ridges
6. the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.
8. Helped create the first scientific map of the ocean floor
9. Super continents that lasted from late paleozoic era until the late triassic period
12. Heated rocks turned liquid from extreme heat from the core
14. Places like Hawaii where volcanic activity on the seabed, often near the boundaries of the tectonic plates that form earth’s crust