Which of the following statements is true about the movement of fluid in a convection cell?
A. Hot fluid rises because it is denser.
B. Cool fluid rises because it is less dense.
C. Cool fluid sinks because it is denser.
D. Hot fluid sinks because it is less dense.

Some mining processes involve removal of large areas of earths surface in the mined region this practice causes severe environmental damage by allowing which natural process to accelerate in the affected areas? a.precipitation b.erosion c.migration d.condensation

In which layer do organisms on earth love?

Which of the following best describes the expensive tissue hypothesis? brains require more energy, so the gut had to be reduced, and larger brains and tool use led to higher quality diets. increasing body size means that homo neanderthalensis had to include more fat in its diet. brains require more energy, so the gut had to be reduced as brains got bigger. brains require more fat, so the gastrointestinal viscera (gut) had to expand, and hands were needed to acquire more food.