The 3 Different Rock Types

Question 0

Describe how limestone is formed as a sedimentary rock

Answer 0

Made from seashells

Grey / whit calcium carbonate

Question 1

How are sedimentary rocks formed?

Answer 1

Layers of sediment laid in lakes or seas
Weight pressing down squeezes out water
Fluid flowing through pores deposit natural cement

Question 2

Describe equation of thermal decomposition of limestone

Answer 2

Calcium carbonate ~ calcium oxide + carbon dioxide

CaCo3 (s) ~ CaO(s). + CO2(g)

Question 3

Describe how metamorphic rocks are formed

Answer 3

Action of heat and pressure on sedimentary or igneous rocks over long periods of time - don’t melt
Mineral structure and texture is different but composition the same

Question 4

How is marble formed?

Answer 4

Is a calcium carbonate
Temperature and pressure breaks down limestone and reforms as small crystals
Harder, more even texture

Question 5

How are igneous rocks formed?

Answer 5

When magma cools
Different minerals in randomly arranged interlocking crystals - very hard
Example - granite - very hard, used for buildings