Question

what are primary rock ?what are the characteristics of primary rock​

Answer 1

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Explanation:

Igneous rocks are also called primary rocks as other rocks are basically formed out of igneous rocks. These rocks are usually fine grained with smooth texture or may have large crystals with coarse texture.

Answer 2

Answer:

A primary rock is a rock whose constituents are newly formed and have never been constituents of some other rock or formed through replacement and alterations. These are basically crystalline rocks with no organic remains on them.

Characteristics:-

1:-There are no fossil deposits in igneous rock types. If there are any fossils present deep inside the crust, they are destroyed when these rocks erupt from the Earth's surface because of the extreme heat they generate.

2:-The majority of igneous formations have several mineral deposits.

3:-They can be gritty or glassy.

4:-Normally, they don't react with acids.

The mineral deposits come in the shape of different-sized patches.

The phrase first appeared in the late 18th century, when crustal rocks were categorised into four categories—Primary, Secondary, Tertiary, and Quaternary—in the first attempts to create a geologic time scale (see Giovanni Arduino and Abraham Gottlob Werner). In The Voyage of HMS Beagle Fossil Mammalia's Geological Introduction to Zoology, published in 1838, Darwin coined the term "basic rocks." According to Richard Owen On the majority of geological time scales used in the 20th and 21st centuries, the last two phrases have persisted. See "On the Origin of Eruptive and Primary Rocks," written by Thomas Macfarlane and published in three sections in The Canadian Naturalist and Geologist Journal of 1863, for an illustration of the broad use and explanation of this term as it was contested in the mid-18th century.

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