The gas humans breathe and is essential for life.
Oxygen
The force that pulls objects toward the center of the Earth?
Gravity
Kinetic
Atoms
The number of bones in the adult human body.
206
Heart
The planet in our solar system that is known as the "Red Planet".
Mars
This type of machine is a seesaw.
Lever
A substance made up of two or more different elements chemically combined
Compound
This causes the change from day to night on Earth.
The rotation of Earth on its axis.
The part of the plant responsible for photosynthesis.
Leaves
What we call a scientist who studies rocks?
Geologist
The name for the push or pull on an object.
Force
This subatomic particle has a negative charge
Electron
186,000 miles per second
The speed of light
The type of blood cell that helps to fight off infections.
White blood cells.
The unit used to measure force (Don't let an apple fall on your head while figuring it out).
Newton
The name given to the substances you start with in a chemical reaction.
Reactants
NaCl
Table salt (sodium chloride)
Amphibian
The layer of the atmosphere in which we live.
Troposphere
This is Newton's second law of motion.
Force = mass x acceleration
A kind of change that results in a new substance being formed
Chemical change/reaction
This measures how acidic or basic a substance is.
The pH scale