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100
Our sun and its nine planets.
What is our solar system?
100
The amount of material in an object.
What is mass?
100
A material used to hold in heat.
What is insulation?
100
An opening in the Earth’s crust through which melted rock is forced.
What is volcano?
100
The path of a planet around the sun.
What is orbit?
200
A group of stars held together by gravity.
What is a galaxy?
200
The explosion that may have started the universe.
What is Big Bang Theory?
200
A place where garbage is buried.
What is landfill?
200
To give off harmful substances.
What is pollute?
200
An imaginary line from the North Pole to the South Pole.
What is axis?
300
The force that pulls any two objects together.
What is gravity?
300
The air surrounding Earth
What is atmosphere?
300
A mixture of plant waste used to make soil richer.
What is compost?
300
Reusing something instead of just dumping it.
What is recycling?
300
An imagined picture made of stars.
What is constellation?
400
A container where garbage is burned.
What is incinerator?
400
What is the center of the Earth?
What is core?
400
The time it takes a planet to spin one complete turn on its axis
What is rotation?
400
A large sea wave made by an underwater earthquake or volcano.
What is a tsunami?
400
A colorless, odorless gas produced when fuel is burned.
What is carbon dioxide?
500
The name of the galaxy where our sun and Earth are found.
What is the Milky Way?
500
The warming of Earth caused by an increase of carbon dioxide in the atmosphere.
What is the greenhouse effect?
500
The 12 monthly constellations that follow each other across the middle of the night sky
What is Zodiac?
500
Yearly changes in temperature caused by the tilt of a planet’s axis as it moves around the sun.
What are seasons?
500
A crack in rock along which plate movement occurs?
What is fault?