Show:
Atmosphere 1
Atmosphere 2
History of the Earth 1
History of the Earth 2
Misc.
100
The layer where air is the densest
What is the troposphere
100
An ozone molecule is made up of 3 of this kind of atom
What is oxygen
100
The largest time unit that the history of the Earth is broken up into
What is an eon
100
The eon when the earth formed
What is the Hadeon eon
100
The theory that states that the universe started with a giant explosion
What is the big bang
200
The layer where the ozone layer is
What is the stratosphere
200
An object in space that is made up of rock in metal
What is an asteroid
200
The eon when life began
What is the Archean eon
200
This is when many species cease to exist at once
What is a mass extinction
200
Right now, the universe is doing what?
What is expanding
300
An object from space that comes into the atmosphere
What is a meteor
300
The most abundant gas in our atmosphere
What is nitrogen
300
The eon when life started coming out onto land?
What is the proterozoic
300
The type of life that filled the atmosphere with oxygen
What is cyanobacteria
300
The period of time when there was an explosion in the diversity of life
What is the Cambrian explosion
400
The layer of the atmosphere where most meteors burn up
What is the mesosphere
400
An object in space that is made up of ice and dust
What is a comet
400
How was it possible that life could come out onto land?
What is the formation of the ozone layer
400
The name of the first supercontinent
What is Rhodina
400
What elements are all life forms made up of?
What is carbon
500
The hottest layer of the atmosphere
What is the thermosphere
500
The type of gas that traps radiation from the sun warming the Earth
What is greenhouse gases
500
The specific period of time when the Earth froze entirely was called
What is Snowball Earth
500
The period of time from when our fossil fuels come from
What is the carboniferous
500
In what country did the meteor hit that killed the dinosaurs?
What is Mexico