Rocks
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Rocks. The Life of a Rock. Layers of sediment join together. Changes are made from pressure and heat. Melted rock cools and hardens. Rocks become smaller , and smaller , and smaller , and smaller . . . By erosion By wind By earthquake By floods By rain By slides By man.

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Rocks

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Rocks


The Life of a Rock

Layers of sediment join together.

Changes are made from pressure and heat.

Melted rock cools and hardens


Rocks become smaller, and smaller, and smaller, and smaller. . .

  • By erosion

  • By wind

  • By earthquake

  • By floods

  • By rain

  • By slides

  • By man


Terms to Know

  • Weathering: the breaking up of rocks and soil

  • Erosion: the moving of weathered rock and soil. Weathering allows erosion to take place.


Products of Weathering

  • Clay

  • Sand

  • Rock Fragments (pebbles and stones)


Rocks change…………..

  • By earthquakes

  • By volcanoes

  • By heat and pressure


Sedimentary Rock is . . .

  • Rock formed when layers of small particles of shell, rock, and sand join together.


Sedimentary RocksHow They are Made

  • Wind and water break down the earth

  • Bits of earth settle in lakes and rivers

  • Layers are formed and build up

  • Pressure and time turn the layers to rock


Sandstone

Limestone

Gypsum

Conglomerate

Shale

Types of Sedimentary Rocks


Fossils

  • Fossils are usually found in sedimentary rock and are the remains or imprints of plants and animals that died long ago.


Fossils-Life From the Past

  • Fossils provide information about life and conditions of the past.

  • Scientific evidence shows that the Earth is approximately 4.5 billion years old


Metamorphic Rock is . . .

  • Rock that is formed when pressure and heat create changes to sedimentary or igneous rock.


Metamorphic RocksWhat are They?

  • Rocks that have changed

  • They were once igneous or sedimentary

  • Pressure and heat changed the rocks


Schist

Gneiss

Types of Metamorphic Rocks


Igneous Rock is . . .

  • Rock that is formed when melted rock cools and hardens.


Igneous RocksWhat are They?

  • Fire Rocks

  • Formed underground by trapped, cooled magma

  • Formed above ground when volcanoes erupt and magma cools


Scoria

Granite

Pumice

Obsidian

Types of Igneous Rocks


Review of the Rock Cycle

  • How are sedimentary rocks formed?

  • What is a fossil?

  • How are metamorphic rocks formed?

  • How are igneous rocks formed?

  • Give an example of each type of rock.

  • What is weathering?

  • Explain what erosion is.


Credits

  • These slides were a compilation of work by:

  • Jefferson County Schools Power Points on Rocks

  • http://jc-schools.net/PPTs-science.html

  • Ellen Benegar (Suffolk Public Schools)


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