Science Crossword

are the substances used in chemistry doing experiments
is the planet that we inhabit
is a group of millions of stars held together by gravity, like the Milky Way
are animals that eat only plants
does not allow water to pass through
are used to detect broken bones
hot molten or semi-fluid rock erupted from a volcano
hot fluid or semi-fluid material below or within the earth's crust
a small rocky body orbiting the sun
when the whole species is dead
a chemical element found in the air as a colorless odorless tasteless gas that is necessary for life