The Earth's Atmosphere Flashcards
1
Q
The air around the Earth is called the ___________
A
atmosphere
2
Q
When the Earth formed, it was covered in _________
A
volcanoes
3
Q
When the Earth formed, the atmosphere was mainly __________ and ____________
A
carbon dioxide and water vapour
4
Q
When the Earth cooled down the water vapour ____________ to form the oceans
A
condensed
5
Q
When plants started to grow, they took in carbon dioxide and released oxygen in a process called ________________
A
photosynthesis
6
Q
Dead plants eventually formed __________ fuels after millions of years.
A
fossil
7
Q
Lots of carbon dioxide ____________ in the oceans
A
dissolved
8
Q
Lots of carbon dioxide ended up in ____________ rocks
A
sedimentary
9
Q
Today the atmosphere is _____% nitrogen gas
A
78
10
Q
Today the atmosphere is _____% oxygen
A
21
