Astronomy
an organized system of millions or billions of stars, gas, solar systems, and dust that are held together by gravitational attraction
Galaxy
The preserved remains of a once-living organism
Fossil
The study of weather
Meteorology
Anything that has mass and takes up space
Matter
the rate at which an object moves
Speed
a force of attraction existing between any 2 masses
Gravity
The process of wearing away or grinding something down by wind, water, or other natural agents
Erosion
Moisture falling from the atmosphere such as rain, snow, or hail
Precipitation
The smallest chemical unit of matter
Atom
the speed of an object in a given direction
Velocity
A natural or artificial body orbiting a planet or star
Satellite
Inorganic crystalline substances found naturally in the Earth
Minerals
A force exerted onto a surface by the weight of air molecules
Air Pressure
Two or more atoms linked together to make a substance with unique properties
Molecule
a push or pull exerted on an object in an effort to change that object’s velocity
Force
The gaseous layer surrounding Earth or another heavenly body
Atmosphere
The decayed remains of once living creatures
Humus
A change in which the atoms or molecules in a substance stay the same
Physical Change
a closed path through which electric current flows
Electric Circuit
the amount of light or radiation reflected by a surface, typically that of a planet or moon
Albedo
A surface of erosion that separates one layer of rock from another
Unconformity
A change that affects the type of molecules or atoms in a substance
Chemical Change
a device that either multiplies or redirects force
Simple Machine