1.
Any substance that has mass and takes up space.
2.
The process of turning from liquid into vapour.
3.
The cycle of processes by which water circulates between the earth's oceans, atmosphere, and land.
4.
A substance made by mixing other substances together.
5.
An animal lacking a backbone.
6.
The arrangement of animals and plants in taxonomic groups according to their observed similarities
7.
A series of organisms each dependent on the next as a source of food.
8.
A system of interlocking and interdependent food chains.
9.
An organism that feeds on producers or other consumers to survive
10.
An organism that makes it own food.
11.
An imaginary line around the middle of a planet or other celestial body
12.
An imaginary line about which a body rotates.
13.
A regular, repeating path that one object in space takes around another one.
14.
The force that attracts a body towards the centre of the earth, or towards any other physical body having mass.
15.
When two forces are the same strength but act in opposite direction.
16.
The force applied in one direction is greater than the force applied in the opposite direction.
17.
A simple machine consisting of a beam or rigid rod pivoted at a fixed hinge, or fulcrum.
18.
Not depleted when used.
