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Why is building on a shaley foundation not recommended?
Why is building on a shaley foundation not recommended?
- Shale is a weak rock that easily erodes.
- Shale has high effervescence when exposed to weak acid.
- Shale's fissility can lead to landslides when the rock becomes wet. (correct)
- Shale contains high concentrations of opaque minerals.
What is the main difference between phaneritic and porphyritic textures in rocks?
What is the main difference between phaneritic and porphyritic textures in rocks?
- In phaneritic rocks, the groundmass and mineral grains have different sizes, while in porphyritic rocks they are almost the same. (correct)
- Phaneritic rocks cool faster than porphyritic rocks, leading to different textures.
- Porphyritic rocks have only large crystal grains, while phaneritic rocks have only fine crystals.
- The size of mineral grains in phaneritic rocks is fine, while in porphyritic rocks it is coarse.
What mineral composition is commonly found in shale?
What mineral composition is commonly found in shale?
- Mainly contains silicate minerals like quartz and feldspars (correct)
- Rich in metallic minerals like iron oxides
- High concentration of mica minerals
- Predominantly composed of carbonate minerals
Which type of rock shows foliation: sedimentary rock or metamorphic rock?
Which type of rock shows foliation: sedimentary rock or metamorphic rock?
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How does the effervescence test with weak acid help identify rocks?
How does the effervescence test with weak acid help identify rocks?
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Which texture is characterized by large mineral grains contrasting with a fine-grained groundmass?
Which texture is characterized by large mineral grains contrasting with a fine-grained groundmass?
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What type of rock is slate?
What type of rock is slate?
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'Shale' is primarily composed of which group of minerals?
'Shale' is primarily composed of which group of minerals?
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'Phaneritic' textures in rocks are mainly characterized by:
'Phaneritic' textures in rocks are mainly characterized by:
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'Porphyritic' textures are distinguished by what feature?
'Porphyritic' textures are distinguished by what feature?
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