Physics
This force keeps us on the ground
Gravity
The chemical symbol for water
H₂O
The basic unit of life
cell
The closest star to Earth
Sun
The solid outer layer of Earth
Crust
The unit of electrical resistance
OHM
The pH value of a neutral substance
7
This organ pumps blood through the body
Heart
The planet known as the Red Planet
The process of water turning into vapor
evaporation
This law states that for every action there is an equal and opposite reaction
Newton’s Third Law
The periodic table was created by this scientist
Dmitri Mendeleev
The process plants use to make food
Photosyntesis
This galaxy contains our solar system
Milky Way
This scale measures earthquake strength
Richter scale
The speed of light is approximately this many km/s
300,000 km/s
This gas is most abundant in Earth's atmosphere
nitrogen
The molecule that carries genetic information
DNA
The first human to walk on the Moon
Neil Armstrong
The largest ocean on Earth
Pacific Ocean
This particle has a negative charge
Electron
The smallest unit of an element
Atom
This system controls the body using nerves and signals
Nervous system
This planet has the most rings
Saturn
This layer of Earth is liquid and surrounds the core
Mantle