Of the internal or external sources of energy for the planet, which one powers the plate tectonic mountain building cycle?
a. radioactive heat from the interior
b. gravitational potential energy
c. sunlight energy
d. chemical potential energy
Which type of energy is behind the faulting of rock layers during an earthquake?
a. sunlight insolation
b. chemical potential energy
c. radioactive decay
d. gravitational potential energy
It has been calculated that potosynthesis, the process of plants using sunlight to make food molecules, is about 4% efficient. When we eat a plant for food our bodies burn the molecules. This buring is about 25% efficient. What is the overall efficiency for this food chain?
a. 1%
b. 21%
c. 29%
d. 100%
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