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Q2. Indians and Africans were considered black. Some Americans were even considered black too.
The type of rock that allows oil, natural gas, and groundwater to flow through them is known as reservoir rock and this can only occur if the rocks are permeable.
<h3>What is a Reservoir Rock?</h3>
This refers to the type of rocks that allows natural gases and fluids to go through them because of their permeability.
Hence, we can see that because the rocks have good permeability, that is they have the ability to allow minerals to flow through them, then this is known as a reservoir rock.
Read more about rocks here:
brainly.com/question/16479523
Answer: Gneiss
Explanation: Gneiss is a metamorphic rock formed from shale at very high temperature and pressure condition. They exhibit a preferred alignment or orientation of platy minerals called foliation. They are coarse grained and exhibit gneissose banding. They are formed from highest grade regional metamorphism with temperature between 450 - 600 degree celcius and pressure between 800 - 1000 mega pascal. They generally occur in cores of fold mountain belts where mountain ranges have been eroded.
