Earth Science Worksheet

the way an object APPEARS to move
plant material and animal waste used as FUEL
electricity produced by the ENERGY in moving water
The SMALLEST piece of matter
a planet that does NOT have a clear orbit
one-HALF of Earth's surface
a star SYSTEM that contains large groups of stars
any fuel that formed form the REMAINS of plants and animals that lived millions of years ago
the BLOCKING of light shining from one object in space onto another
a LARGE rocky object that orbits a planet
EVERYTHING that exists throughout space
materials that are always being REPLACED and will not run out
the presence of substances that are HARMFUL to the environment or living things
the act of moving AROUND another object
the act of SPINNING around
resources that CANNOT be replaced quickly enough to keep from running out
a ball of hot gases that give off LIGHT and other types of energy
the PATH one object takes around another
a largem nearly round object in space that ORBITS a star