Chemistry- Topic 1 + 2

Question 1

Metamorphic

Answer 1

Marble

• formed by heat and pressure
• used to be limestone

Question 2

Sedimentary

Answer 2

Limestone

• compaction of layers of sediments over long period of time
• may have fossils
• easily eroded by wind/rain

Question 3

Advantages of quarrying

Answer 3

Provides building materials
Money to local economy
Jobs
Improve transports links

Question 4

Disadvantages of quarrying

Answer 4

eye sore 
Noise pollution
Destroys habitats
Traffic
Waste

Question 5

Early atmosphere

Answer 5

-little or no oxygen
-large amounts of CO2
-water vapour
1- earth cooled- water vapour condensed- formed the oceans
2- carbon dioxide decreased by dissolving into oceans and taking in by marine organisms which then formed carbonate rocks

Question 6

Today’s atmosphere

Answer 6

78% Nitrogen
21% oxygen
0.04% carbon dioxide

Question 7

Changes in atmosphere

Answer 7

Deforestation
Farming
Burning fossil fuels
Volcanic activity

Question 8

Igneous

Answer 8

Granite

• formed by magma which solidifies
• extrusive rocks- cools quick+ small crystals
• intrusive rocks- cools slow+ big crystals