Answer:
natural gas from fracking
Explanation:
Biomass fuel is made from organic material. Natural gas is not considered a source of biomass fuel, as it itself is fuel.
Answer:
e. a useful illusion used to map the stars and other objects in the sky
Explanation:
A celestial sphere is a graphical representation whose purpose is to describe the different locations of objects in the sky. A Celestial Sphere depiction contains Earth's rotation axis, North Celestial Pole, South Celestial Pole and Celestial Equator.
Explanation:
The types of energy used in the United States have changed over time. The change has been driven by advances in technology, energy resource discoveries, energy prices, social pressures and other factors. The only constant is that the amount of energy used has increased steadily over time.
I believe the answer would be 12, are there any more numbers?
Answer:
Unlike previous mass extinctions, the sixth extinction is due to human actions. Some scientists consider the sixth extinction to have begun with early hominids during the Pleistocene.