18. how might you control variables
in an experiment about landscaping
techniques?
critical thinking
19. explain how you can reduce, reuse,
and recycle to avoid wasting plastic
shopping bags.

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.

answer; ///blank(1); green bananas; blank(2); raw potatoes;

potentially fatal issues such as heart attacks and strokes

explanation: