unit 2.4 Flashcards
What is the crust section of the earth?
A thin, rocky layer.
What is the mantle section of the earth?
A semi-liquid layer beneath the crust. Convection current appears here.
What is the outer core section of the earth?
An extremely hot liquid made from nickel and iron.
What is the inner core section of the earth?
An extremely hot solid made from nickel and iron.
What are tectonic plates?
Large peices of the earths crust that move a few centimetres every year due to convection currents in the mantle.
What are the three types of plate margins?
- Constructive
- Conservative
- Destructive
What happens at a constructive plate margin?
- Plates move apart to form new land.
- This can cause volcanos.
What happens at a conservative plate margin?
- Plates slide past each other.
- This can cause earthquakes.
What happens at a destructive plate margin?
- One plate is pushed below the other which forms trenches.
- This can cause volcanos and earth quakes.
What are the % amounts of each main gas found in the earths atmosphere?
- Nitrogen = 78%
- Oxygen = 21%
- Carbon dioxide = 0.04%
- Argon = 0.93%
What is thr word equation for photosynthesis?
Carbon dioxide + Water = Oxygen + glucose
What is the word equation for respiration?
Oxygen + Glucose = Carbon dioxide + water
What were the steps to the evoulution of the earths atmosphere?
- The earth was covered in volcanos that released lots of gases.
- The earths atmosphere began to form and it was mostly carbon dioxide.
- Oceans were formed from water vapour and carbon dioxide began to dissolve into oceans and formed sediments on the sea bed.
- Green plants and algae evolved and started to photosynthesise to release oxygen.
- Animals evolved.
How would you seperate gases in air?
You would make it very cold to liquefy it then allow it to slowly warm up to collect gas.
