Which of these is a similarity between a polar and a subtropical jet stream? Both bring in cool air from the poles.
Both are formed at latitudes close to the poles.
Both are formed at latitudes close to the equator.
Both are formed at the boundary of warm and cool air masses.

bc blah

explanation:

bc blah

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

which