General inflammation of a joint cavity is called:

The phases of the Moon occur because

The atmospheres of Earth are thought to have erupted from the interiors of the planet itself.

The cores in the terrestrial planets are thought to be made out of gas.

How did astronomers determine the age of our solar system?

Venus has a high surface temperature because

Which of the following is a reason that Earths surface has very small number craters as compared to our Moons craters?

In the greenhouse effect,

With electromagnetic waves, shorter wavelengths mean lower energies.

Epicycles are used in a geocentric model to explain the