The material that supports vegetation and is a mixture of weathered rock, mineral fragments, organic matter, water, and air (we call it dirt).
What is soil?
100
The daily rise and fall in sea level.
What is the tide?
100
The speed of an object in a particular direction.
What is velocity?
100
A class of energy-giving nutrients that includes sugars, starches, and fiber; contains carbon, hydrogen, and oxygen.
What is a carbohydrate?
100
A covalently bonded compound that contains carbon.
What is an organic compound?
200
The process that wears away surface materials and moves them from one place to another.
What is erosion?
200
A long, narrow, steep-sided depression in the ocean floor.
What is a trench?
200
The rate at which velocity changes over time.
What is acceleration?
200
A fat molecule, or a molecule that has similar properties; examples include oils, waxes, and steroids.
What is a lipid?
200
An area where waste is deposited.
What is a landfill?
300
A moving mass of ice and snow.
What is a glacier?
300
Water that doesn't soak into the ground or evaporate but instead flows across Earth's surface.
What is run off?
300
A force that opposes motion between two surfaces that are in contact.
What is friction?
300
A molecule that is made up of amino acids and that is needed to build and repair body structures and to regulate precesses.
What is a protein molecule?
300
Rain, snow, sleet, or hail with a pH below 5.6 that can kill plants, trees, and fish, and damage the surfaces of cars and buildings.
What is acid rain?
400
A triangular or fan-shaped deposit of sediments that is formed when a stream or river slows and empties into an ocean, gulf, or lake.
What is a delta?
400
The measure of the amount of salts dissolved in seawater, which is ususally measured in grams of salt per kilogram of water.
What is salinity?
400
A force of attraction between objects that is due to their masses.
What is gravity?
400
A collection of stars, dust, and gas bound together by gravity.
What is a galaxy?
400
An interaction that holds atoms and ions together.
What is a chemical bond?
500
The type of erosion in which gravity alone causes loose materials to move downslope and that can happen quickly or slowly (a landslide is one example).
What is mass movement?
500
The complete land area from which a stream gets its water.
What is a drainage basin?
500
The tendency of an object to resist being moved or, if the object is moving, to resist a change in speed or direction until an outside force acts on the object.
What is inertia?
500
A planet that has a deep, massive atmosphere,such as Jupiter, Saturn, Uranus, or Neptune.
What is a gas giant?
500
An object's change in position relative to a reference point.