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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

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C 3 chemicals in our lives risks benefits

C3 Chemicals in Our Lives – Risks & Benefits

Lesson 2: Useful Rocks


Objectives
Objectives

  • MUSTexplain how resources in the Earth were formed

  • SHOULD explain how geologists discover how rocks were formed

  • COULD explain how the development of the chemical industry depended on resources being available nearby


Key words
KeyWords

  • You need to be able to define the following:

    • Sediment

    • Sedimentary rock

    • Eroded

    • Dissolved

    • Evaporated


Textbook answers
Textbook Answers

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.


Worksheet answers
Worksheet Answers

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.


Worksheet answers1
Worksheet Answers

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.