practical

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  • Created by: ra9718
  • Created on: 26-04-16 17:50

1. what do you need to label in the sketch?

  • fold axis/fold limb/mineral veins/joints/ hinges/fault/competent and incompetent bed
  • Thickness of any bed and labelled correctly, Dip of the left or right limb
  • axial plane/fold limb/mineral veins/joints/ hinges/fault/competent and incompetent bed
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2. what are the characteristics of rhyolite?

  • Banded darker and lighter bands. Darker layers look glassy.
  • En bandas bandas claras y oscuras . capas más oscuras vidriosos .
  • Banded darker and lighter bands
  • Darker layers look glassy.

3. what is the form and shape of pillow lavas?

  • pillow and bulbous shape(rounded structures)
  • bulbous shape(hexagonal structures)
  • rectangular structures

4. how is rhyolite formed?

  • Rapid cooling means no crystals form in glassy layers
  • Flow banding- crystallising parallel to flow. Rapid cooling means no crystals form in glassy layers
  • franja de flujo- cristalizar paralelo a fluir. El enfriamiento rápido significa que no se forman cristales en las capas vítreas

5. what happens to the surface?

  • it cools quickly but the lava still flows underneath
  • it cools slowly but the lava still flows underneath
  • it cools quickly and the lava stops flowing

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