how geologists classify rocks. geologist classify according to texture texture is the look and feel...

How Geologists Classify Rocks

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How Geologists Classify Rocks

Geologist classify according toTEXTURE

• Texture is the look and feel of a rock’s surface.• Texture can be described as– fine grained – with small particles

– Coarse grained – with large particles

– Glassy – no visible grain

Page 3: How Geologists Classify Rocks. Geologist classify according to TEXTURE Texture is the look and feel of a rock’s surface. Texture can be described as –

Geologists classify according to Origin

• Igneous – forms from cooled magma or lava• Sedimentary –forms from particles of other

rocks or the remains of plants and animals that have compacted and cemented.

• Metamorphic – forms from rock that has been changed due to heat and pressure deep below earth’s crust.

Page 4: How Geologists Classify Rocks. Geologist classify according to TEXTURE Texture is the look and feel of a rock’s surface. Texture can be described as –

IGNEOUS

• Igneous – forms from cooled magma or lava

Page 5: How Geologists Classify Rocks. Geologist classify according to TEXTURE Texture is the look and feel of a rock’s surface. Texture can be described as –

Sedimentary

forms from particles of other rocks or the remains of plants and animals that have compacted and cemented.

Page 6: How Geologists Classify Rocks. Geologist classify according to TEXTURE Texture is the look and feel of a rock’s surface. Texture can be described as –

Metamorphic

– forms from rock that has been changed due to heat and pressure deep below earth’s crust.

Page 7: How Geologists Classify Rocks. Geologist classify according to TEXTURE Texture is the look and feel of a rock’s surface. Texture can be described as –

Geologists classify rocks according to Mineral composition

• Microscopes can be used to see crystal shape and structure

• Acid test can be used to test for carbonates

• Magnet test can be used to test for iron or nickel

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