The energy in fossil fuels comes from Select one:
a. soft and hard coal.
b. solar energy stored by plants.
c. oil and natural gas.
d. sugars made by plants.

The average density of the planet uranus is 1.27 103 kg/m3. the ratio of the mass of neptune to that of uranus is 1.19. the ratio of the radius of neptune to that of uranus is 0.969. find the average density of neptune.

What is an electric motor? explain its operation. 2-3 sentence

Mixing salt in water is an example of physical change