Revising Geology #10

SEDIMENTARY ROCKS

Sedimentary rocks are important because

  • they make up much of the surface of the crust
  • they contain information about the history of the earth – the conditions of deposition
  • they provide raw materials for industry, building etc

What does the classification of sedimentary rocks tell you about their mode of formation?

Write a 12-word description of clastic sedimentary rocks which says how they formed and how they were formed.

Write a 12-word description of calcareous sedimentary rocks which says how they formed and how they were formed.

Write a 12-word description of evaporite deposits which says how they formed and how they were formed.

Compile a chart which compares the typical features of sedimentary rocks compared with igneous and metamorphic rocks.

How would you recognise a sedimentary rock

  • in the field?
  • on a geology map?

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Exam technique #10

DIAGRAMS IN GEOLOGY

Diagrams are very important in Geology – from fieldwork to working with maps (which are of course sophisticated diagrams). They give a visual description of the information you are trying to put into words. In exams, they can save a lot of time. Drawing diagrams is a skill which it is well worth perfecting, Yet many candidates seem to treat diagrams as unimportant – and lose marks accordingly.

The keywords are:

  • neat
  • labels
  • arrows
  • scale
  • compass directions
  • title

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