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Sedimentary, metamorphic and igneous.

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Q: What are the three main categories into which geologists classify rocks?
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What are three groups into which geologists classify rocks?

Igneous rocks.Sedimentary rocks.Metamorphic rocks.


What do scientists classify rocks into what one of the three main categories by?

It is how they are formed.


How do geologists classify rock?

Geologists classify rocks into three groups. The first group are igneous rocks, the second are metamorphic rocks and the third are sedimentary rocks.


Describe granite using the three characteristics geologists use to classify igneous rocks?

Granite is a felsic, coarse grained, intrusive igneous rock.


What three things are used to classify igneous rocks?

Color and texture is one way to classify igneous rocks. Another way to do this is modal classification and normative classification.


What are the three categories that rocks are classified in?

Igneous, metamorphic and sedimentary are the three rock types.


What are three types of categories found in the periodic table?

The three main categories of elements on the periodic table are metals, metalloids, and nonmetals.


Name three ways geologists study a rock sample?

geologists can study a rock sample by observing its composition, color, and texture. they also look at the rocks structure, hardness and weight.


What determines how rocks are grouped into the three different types?

Rocks are classified into the three categories, based on the method of their formation: Three main categories - igneous (solidified from magma/lava) metamorphic (undergone change from applied heat/pressure) sedimentary (deposited- can be clastic, biochemical and precipitated)


What are the three categories of sedimentary rocks?

Clastic Rocks, Organic Rocks, and Chemical Rock


Is a sedimentary rock an igneous rock?

No. Igneous, sedimentary, and metamorphic rocks are three different categories of rock.


What three broad categories do economist use to classify all economic systems?

Economic system is some sort of arrangements regarding the production of goods and services to satisfy human wants and needs.Economist deals with three questions to classify all economic system,which are:*What to produce?*How to produce?*For whom to produce?By answering these three questions economists make any economic decision.