Earth and Atmosphere Flashcards
What are the three main layers of Earth?
What are the three main layers of Earth? Crust, mantle, core
Which layer of Earth is made of solid rock?
Crust
Which layer of Earth flows very slowly?
Mantle
Which layer of earth is solid metal?
Core
Why can the crust move
It has tectonic plates, which are moved by the mantle
What are the three types of rock?
What are the three types of rock? Sedimentary, igneous, metamorphic
How do sedimentary rocks form?
Smaller bits of other rocks get stuck together
What are the properties of sedimentary rock?
Crumbly, they form in layers.
How do igneous rocks form?
When molten rock cools and solidifies.
How do metamorphic rocks form?
When rocks are heated or compressed in the earths crust.
In what kind of rocks are fossils found?
Sedimentary rock
What is porous rock?
A rock which absorbs water
What are the two main gases in Earths atmosphere?
Oxygen and nitrogen
What approximate% of Earth’s atmosphere is nitrogen?
78%
What approximate % of Earth’s atmosphere is oxygen?
21%
Name two gases other than oxygen and nitrogen that are in Earth’s atmosphere
Carbon dioxide, water vapour
How is carbon dioxide removed from the atmosphere?
Photosynthesis
In what three ways is carbon dioxide added to the atmosphere?
Respiration, combustion of fossil fuels, decomposition
Why is adding more carbon dioxide to the atmosphere a problem?
It causes global warming (which causes climate change)
How has the amount of carbon dioxide in the atmosphere changed over the last 200 years?
Increased rapidly
Why has the amount of carbon dioxide in the atmosphere increased rapidly over the last 200 years?
Humans began burning fossil fuels
What is the order of earths layers from top to bottom?
1-Crust
2-Mantle
3-Core
Which plant cell’s do not contain chlorophyl
Root hair cells
What type of organisms carry out decay?
Decomposers
Give two examples of decomposers.
Bacteria, Fungi
