The igneous structures usually included in exam questions are: plutons, dykes, sills, lavas. They may feature in the written exams, but also in mapwork questions.
a. How can you recognise each of these in the field or on a map, and distinguish between them? Use
- grain size
- massive or sheet-like
- nature of the contact between the igneous rock with the country rock
- relationship between the structure of the igneous feature and the bedding of the country rock.
Make up a chart which summarises these points.
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More about mathematical Geology questions.
1. Instructions given in the question stem.
Give a sensible approximation or order of magnitude – no need to reach for your calculator. Note – an estimate is not a guess!
Use a ruler or protractor to get an accurate result! If you are NOT accurate, you WILL lose marks.
You must bring a decent ruler (preferably 30cms long) and a protractor to all Geology exams.
Work out the exact answer from the information given.
- you must show your working!
- show the units, if not given already.
Check your answer. Does it agree with your initial estimate?
Similar to ‘calculate’, using known values and a standard formula.