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Comets in the solar system are believed to originate in either the Oort Cloud or the ______.

The deflection of moving objects to the right in the Northern Hemisphere and to the left in the Southern Hemisphere is known as the __________.

Uranium-238 through a series of decay processes will eventually become _____.

The number of protons plus neutrons in an atom’s nucleus is the atom’s ________.

______ is a measure of radiation that considers the biological effects of different kinds of ionizing radiation.

Two isotopes of the same element have the same number of _________.

Earth rotates ________.

We always see the same side of the Moon because ______.

The findings from the Apollo space missions to the Moon support the idea that the Moon formed from the impact of Earth with a very large object.

The splitting apart of large isotopes into smaller ones is known as _____.