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Geology: Syncline vs. Anticline and Silicate Minerals

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Geology: Syncline vs. Anticline and Silicate Minerals

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Questions and Answers

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?

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?

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?

Metamorphic rock Signup and view all the answers

How does the effervescence test with weak acid help identify rocks?

It indicates the presence of carbonate minerals in the rocks. Signup and view all the answers

Which texture is characterized by large mineral grains contrasting with a fine-grained groundmass?

'Porphyritic' texture Signup and view all the answers

What type of rock is slate?

Metamorphic rock Signup and view all the answers

'Shale' is primarily composed of which group of minerals?

'Silicate minerals' Signup and view all the answers

'Phaneritic' textures in rocks are mainly characterized by:

'Groundmass and mineral grains of similar size' Signup and view all the answers

'Porphyritic' textures are distinguished by what feature?

'Different sizes of groundmass and mineral grains' Signup and view all the answers