Rock types

Question 1

What are the 3 types of rock

Answer 1

Igneous, sedimentary and metamorphic

Question 2

how are igneous rocks formed

Answer 2

Formed from magma > pushed up through the crust (Often out through the volcanoes)
Contain various minerals in randomly arranged interlocking crystals
Large crystals - cooled slowly
Small crystals - cooled quickly
Basalt (extrusive)
granite (intrusive)

Question 3

How are sedimentary rocks formed

Answer 3

Formed from layers of sediment over lakes or seas over millions of years OR when water evaporates leaves a dissolved solid behind. Layers are cemented by other minerals. Fossils can form in sediments
sedimentary rock examples - limestone

Question 4

How are metamorphic rocks formed?

Answer 4

Heat and pressure acting on rocks over long period of time
May have tiny crystals and some layers

Question 5

What are rocks made out of

Answer 5

Minerals

Question 6

What are minerals made out of

Answer 6

elements and compounds

Question 7

Give the labels for the minerals

Answer 7

Elements - Oxygen, silicon
Compound - Silicon dioxide
Minerals - quartz (1cm)
Rocks - Granite (5cm)