elements
two or more elements put together
compound
a large area of land with few hills
plain
a body of ice and rock that orbits the sun
comet
a source of electricity
cell
matter that has a definite volume but no shape
liquid
different types of matter mixed together
mixture
a large mass of ice in motion
glaciers
a small chunk of rock or metal that orbits the sun
asteroids
the path electricity flows through
circuit
solid
a characteristics of something
property
an opening in the surface of earth
volcano
a resources that can be replaced or be used over and over again
renewable resources
open and closes an electric circuit
switch
matter that has no definite shape or volume
gas
how hot or cold something is
temperature
an area of land lying between hills
valley
occurs when weathered materials are carried away
erosion
what happens when harmful substances get into water, air or land
pollution
a building block of matter
element
the unit of measurement for temperature
degree
to bounce of a surface
reflect
the process that causes rocks to crumble crack and break
weathering
a sudden movement in the rocks that make up earth's crust
earthquake
how much matter is in an object
mass