Answer: savanna
Explanation:
Savannas have an extensive dry season and consequent fires. As a result, there are relatively few trees scattered in the grasses and forbs (herbaceous flowering plants) that dominate the savanna
When two oceanic plates converge, the denser plate will end up sinking below the less dense plate, leading to the formation of an oceanic subduction zone. Old, dense crust tends to be subduction back into the earth.
Because Earth's outer core is liquid and S waves cannot travel trough liquids
Uneven warming by the sun I believe
