If the barometer at a weather station fell by 1.9 millibars over the past 3 hours, what code would be shown on the station model?

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.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.

it's d - life cycles - apex