C 3 Chemicals in Our Lives – Risks & Benefits. Lesson 2 : Useful Rocks. Objectives. MUST explain how resources in the Earth were formed SHOULD explain how geologists discover how rocks were formed
Lesson 2: Useful Rocks
1) a) Coal, limestone, salt; b) Easy to transport to the factories.
2)Sedimentation – limestone and coal; evaporation – salt; mountain building – limestone; dissolving – salt; erosion – limestone.
3) Coal was formed in hot tropical climates; salt was formed when climates turned hot and dry.
4) a) Contains small, smooth grains of wind-blown sand.
b) Made up of shells of animals that lived in the sea and contains other fossil sea creatures; there may be ripples showing that the rock was formed on the bed of rivers or the sea.
Activity 1 (Low demand)
1) Coal – burning in steam engines; limestone – building and farming; salt – flavouring and preserving food.
Activity 2 (Standard demand)
1) Rock cycle diagram; coal – sedimentation and compression; limestone – sedimentation, compression, uplift, weathering, erosion; salt – dissolving, evaporation, compression.
2) Moved through different climates; which resulted in different rocks being laid down.
Activity 3 (High demand)
1) Contains small, rounded grains.
2) Waves when the sediment lay at the bottom of a river or sea.
3) The age of the rock; the conditions in which the rock formed; the climate at the time.