The pull of gravity on Earth is caused by
A B C D
air pressure. the mass of Earth. volcanoes erupting. Earth's orbit around the Sun.
Question: The pull of gravity on Earth is caused by
(A) air pressure.
(B) the mass of Earth.
(C) volcanoes erupting.
(D) Earth's orbit around the Sun.

Answer: (B) the mass of Earth.
Answer: (D) Earth's orbit around the Sun.
Question: The pull of gravity on Earth is caused by
(A) air pressure.
(B) the mass of Earth.
(C) volcanoes erupting.
(D) Earth's orbit around the Sun.
Answer: (B) the mass of Earth.