QUESTION 1 Select the choice below that best describes the role of volatiles in

Question

QUESTION 1 Select the choice below that best describes the role of volatiles in an ascending magma. Volatiles increase the rate of crystallization in intrusive structures Volatiles will force the magma to contract as it rises Volatiles will shatter surrounding rocks, making it easier for the magma to rise 1 poiats QUESTION 2 1. The partial melting of a mafic magma would produce what composition of igneous rocks? Ultramafic Mafic Intermediate Felsic 1 points QUESTION 3 1. What creates the small holes found in a vesicular texture? Liquid water Volatiles Soluble minerals Weathering l points QUESTION 4 What is the geological definition of texture? 1. How the sample feels to the touch The mineral content of the sample The percentage of silica in a sample Size and shape of mineral grains in the simple 1 points QUESTION 5 What is the name of the pre-existing rock that is displaced by intrusive igneous bodies? Acid Rock Parent Rock Stock Country Rock 1. 1 points QUESTION 6 1. What is the term used to describe increased temperature with depth in the Earth?

Explanation / Answer

Q 20 : 95%

EXPLANATION : Igneous rocks and metamorphic rocks derived from igneous "parents" make up 95 percentage of the Earth's crust.

Q 19: OXYGEN (O2)

Rest all given gases are voltaile in nature expect oxygen

Q 17  Potassium Feldspar is a non ferromagnesian mineral

Q16 QUARTZ

QUARTZ is the First mineral on the Bowen's Reaction Series to melt if an igneous rock is heated.

Q15: Olivine

Olivine is the Last mineral on the Bowen's Reaction Series to melt if an igneous rock is heated.

Q 14: Silicates

It is the mineral class which makes up the most igneous rocks

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