Plastic debris are a major source of marine pollution, endangering many marine mammals, birds and fish. Computer simulations are being used to analyze the redistribution and accumulation of this material. What factor, in addition to the mass, buoyancy and persistence of these materials, would be critical in studying their motion?

a. suckling by young

b. hypothalamus

c. dopamine

d. trh

e. anterior pituitary

f. mammary glands

g. milk production

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.