Objects on the moon's surface have an aceteration due to gravity one sixth that on the earths. what would the 50 kg boy weigh on the moon?

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.

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added