ChapC2.2

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Information about ChapC2.2

Published on March 31, 2008

Author: stviator4b

Source: slideshare.net

Description

Rocks

Types of Rocks

Igneous Rock rock: a material made up of one or more minerals rocks are not crystals - minerals are crystals some rocks form at or near Earth’s surface some rocks form deep in the crust - in the Earth’s middle layer (mantle) rocks are classified into 3 groups based on how they are formed

rock: a material made up of one or more minerals

rocks are not crystals - minerals are crystals

some rocks form at or near Earth’s surface

some rocks form deep in the crust - in the Earth’s middle layer (mantle)

rocks are classified into 3 groups based on how they are formed

igneous rock: rocks that forms when melted rock hardens lava is melted rock that reaches Earth’s surface lava cools and hardens quickly large mineral pieces do not have time to form rocks formed from lava have small mineral pieces and are called fine-grained

igneous rock: rocks that forms when melted rock hardens

lava is melted rock that reaches Earth’s surface

lava cools and hardens quickly

large mineral pieces do not have time to form

rocks formed from lava have small mineral pieces and are called fine-grained

magma: melted rock below Earth’s surface magma cools and hardens slowly minerals can form large grains that are easy to see rocks formed from magma are called coarse-grained

magma: melted rock below Earth’s surface

magma cools and hardens slowly

minerals can form large grains that are easy to see

rocks formed from magma are called coarse-grained

basalt is the most common igneous rock forms from lava at Earth’s surface dark, greenish-black rock made of minerals feldspar and pyroxene gabbro is an igneous rock made of feldspar and pyroxene has larger mineral grains forms inside Earth instead of at surface basalt gabbro

basalt is the most common igneous rock

forms from lava at Earth’s surface

dark, greenish-black rock

made of minerals feldspar and pyroxene

gabbro is an igneous rock made of feldspar and pyroxene

has larger mineral grains

forms inside Earth instead of at surface

pumice : another igneous rock tiny holes in pumice caused from gases escaping from lava as it cools feels rough and scratchy obsidian : forms from lava lava cools so quickly that rocks look like black glass when it breaks sharp edges form granite : common igneous rock forms when magma cools slowly beneath Earth’s surface made of large grains of feldspar, quartz, and mica

pumice : another igneous rock

tiny holes in pumice caused from gases escaping from lava as it cools

feels rough and scratchy

obsidian : forms from lava

lava cools so quickly that rocks look like black glass

when it breaks sharp edges form

granite : common igneous rock

forms when magma cools slowly beneath Earth’s surface

made of large grains of feldspar, quartz, and mica

GRANITE OBSIDIAN PUMICE

Sedimentary Rock weathering: how rocks are broken down into smaller pieces wind, water, ice, and plant roots cause weathering rocks weathered into small pieces and moved to other places by wind, water, gravity, or slow moving glaciers erosion: movement of weathered rock pieces from one place to another

weathering: how rocks are broken down into smaller pieces

wind, water, ice, and plant roots cause weathering

rocks weathered into small pieces and moved to other places by wind, water, gravity, or slow moving glaciers

erosion: movement of weathered rock pieces from one place to another

erosion caused by water - over time rock pieces drop to lake, river, stream bottoms this material is sediment layers of sediment form sedimentary rock because all the layers squeezed and get stuck together conglomerate is a type of sedimentary rock pieces can be big as boulders or small as peas pieces are round and smooth form in shallow water

erosion caused by water - over time rock pieces drop to lake, river, stream bottoms

this material is sediment

layers of sediment form sedimentary rock because all the layers squeezed and get stuck together

conglomerate is a type of sedimentary rock

pieces can be big as boulders or small as peas

pieces are round and smooth

form in shallow water

smaller sediments are carried farther and dropped later siltstone is a rock made of smaller sediments limestone : fine-grained sedimentary rock made of mostly mineral calcite forms in oceans sometimes from seashells a few form in lakes

smaller sediments are carried farther and dropped later

siltstone is a rock made of smaller sediments

limestone : fine-grained sedimentary rock

made of mostly mineral calcite

forms in oceans

sometimes from seashells

a few form in lakes

sandstone another kind of sedimentary rock made of bits of rock and minerals the size of sand grains nearly all sandstone is made of mostly the mineral quartz some sandstone are fine-grained feel smooth when you touch them some sandstone are coarse-grained feel rough against skin can form on land or in water

sandstone another kind of sedimentary rock

made of bits of rock and minerals the size of sand grains

nearly all sandstone is made of mostly the mineral quartz

some sandstone are fine-grained

feel smooth when you touch them

some sandstone are coarse-grained

feel rough against skin

can form on land or in water

shale : fine-grained sedimentary rock made of small sediments sediments so small that you can only see them with a magnifying glass or microscope

shale : fine-grained sedimentary rock

made of small sediments

sediments so small that you can only see them with a magnifying glass or microscope

Metamorphic Rocks metamorphic rocks: rocks that were changed due to high heat and pressure texture (the way a rock looks and feels) and the minerals that make up the rocks are changed metamorphic rocks can form from any rock sedimentary, igneous, or other metamorphic rocks

metamorphic rocks: rocks that were changed due to high heat and pressure

texture (the way a rock looks and feels) and the minerals that make up the rocks are changed

metamorphic rocks can form from any rock

sedimentary, igneous, or other metamorphic rocks

some metamorphic rocks form when mountains built up schist has wavy lines splits into layers easily gneiss forms when schist is heated and squeezed more has bands of light and dark minerals Schist Gneiss

some metamorphic rocks form when mountains built up

schist

has wavy lines

splits into layers easily

gneiss

forms when schist is heated and squeezed more

has bands of light and dark minerals

marble is another metamorphic rock forms when limestone is squeezed and heated slate forms when shale is under great pressure has layers quartzite forms from sandstone when heat melts the sand grains together milky color other minerals can give it a gray or pink color

marble is another metamorphic rock

forms when limestone is squeezed and heated

slate

forms when shale is under great pressure

has layers

quartzite

forms from sandstone when heat melts the sand grains together

milky color

other minerals can give it a gray or pink color

QUARTZITE SLATE MARBLE

Summary rocks are made up of one or more minerals classified by how they are formed igneous rocks form when magma or lava cools and hardens sedimentary rocks made of pieces of rock that have been squeezed and stuck together metamorphic rocks form when heat and pressure change rocks

rocks are made up of one or more minerals

classified by how they are formed

igneous rocks form when magma or lava cools and hardens

sedimentary rocks made of pieces of rock that have been squeezed and stuck together

metamorphic rocks form when heat and pressure change rocks

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