Materials From The Earth

Question 1

How are sedimentary rocks formed (limestone and chalk)

Answer 1

Layers of sediment laid in lakes of seas build up over millions of years and water squeezes out

Question 2

How are metamorphic rocks formed (Marble)

Answer 2

Heat and pressure on metamorphic or igneous rocks

Question 3

How are igneous rocks formed

Answer 3

Magma cools

Question 4

What are extrusive igneous rocks (basalt)

Answer 4

Cool quickly above ground form small crystals

Question 5

What are intrusive igneous rocks (granite)

Answer 5

Cool slowly underground forming big crystals

Question 6

How is limestone formed

Answer 6

Crushed sea shells

Question 7

What is limestone used for

Answer 7

Building materials
With clay makes cement
With sand water and gravel makes concrete
With sand and sodium carbonate makes glass
Road surfacing

Question 8

Positives of quarrying limestone

Answer 8

Used for medicine
Neutralises acidic soil
Neutralises sulfur dioxide

Question 9

What is limestone mostly made of

Answer 9

Calcium carbonate - CaCO3

Question 10

What happens when calcium carbonate is thermally decomposed

Answer 10

Makes calcium oxide (CaO) and CO2

Question 11

What happens when you react calcium oxide with water

Answer 11

Calcium hydroxide which is an alkali that neutralises acidic soil. Dissolves in water to produce limestone