This is the element we need to breath, which composes about 20% of Earth's atmosphere.
What is oxygen?
This sphere contains all water on earth in all its forms.
What is the hydrosphere?
We watched a video by this famous science personality to learn about fossils.
Who is Bill Bye?
Earth is the ____ planet from the sun.
What is the third?
This unit is the distance light travels over one year.
What is a light-year?
Jets and the protective ozone layer can be found in this layer of the atmosphere.
What is the stratosphere?
"Litho" translates from Greek to this.
What is stone?
This is an example of what type of fossil?
What is a trace fossil?
This process is primarily responsible for forming planets and stars from clouds of dust.
What is gravity?
These objects have such a strong gravitational pull that not even light can escape.
What are black holes?
This mostly inert gas makes up the majority of Earth's atmosphere.
What is nitrogen?
The pet gerbils in Mr. Schratter and Ms. Gutkowski's rooms are primarily a part of this sphere.
What is the biosphere?
Fossils are most commonly found in this type of rock.
What is sedimentary rock?
An astronomical unit, or AU, is the average distance between what two celestial bodies?
What is the Earth and the Sun?
This is the closest galaxy to The Milky Way.
What is Andromeda?
This effect is the process by which certain gases trap heat in Earth's atmosphere, keeping the planet warm enough to support life.
What is the greenhouse (gas) effect?
~97% of Earth's water is in these.
What are oceans?
The study of fossils is known as this branch of earth science.
What is paleontology?
Earth's tilt is approximately this many degrees?
What is 25.5°?
This is an example of what type of galaxy?

What is elliptical?
This hottest layer of Earth's atmosphere is responsible for the aurora borealis.
What is the thermosphere?
A subsection of the hydrosphere, this sphere contains all frozen water on Earth.
What is the cryosphere?
This is an example of what type of fossil?

What is an amber fossil?
This planet is the only one in our solar system to spin clockwise.
What is Venus?
Who is Edwin Hubble?