https://www.facebook.com/VeronaCedarGroveTimes/posts/1898669310177734All about Topography Maps - A Powerpoint PresentationRocks are everywhere. They have been on the earth for over four billion years. The rock you pick up from the ground might have once been part of a mountain or cave. It might have been around when dinosaurs roamed the earth.There are three kinds of rocks. The way they are formed determines the kind of rock that they are. Click on each kind to learn more information.IGNEOUS ROCKS
- Igneous rocks are the oldest kind of rock.
- Igneous rocks are formed deep inside the earth where the temperature is very high.
- The minerals in the earth are in liquid form and are called magma.
- Magma is squeezed around inside the earth and as it pushes towards the surface of the earth, it starts to cool. As it cools, it turns to solid igneous rock.
- Sometimes the magma cools very slowly and forms rocks.
- Igneous rocks that cool slowly deep in the earth are called Intrusive igneous rocks and have large crystals. (Granite)
- Sometimes the magma erupts from a volcano. Magma is called lava when it reaches the earth's surface. Lava cools quickly and forms igneous rocks.
- Igneous rocks that cool quickly on the surface of the earth form rocks with small crystals called extrusive rocks. (Basalt, obsidian)
- Sometimes extrusive igneous rocks look like glass and have no crystals or mineral particles.
- Sedimentary rocks are made from sediments.
- Sediments are small pieces of other rocks. They turn into pebbles, gravel, sand and clay.
- Rocks are always being broken into smaller pieces called sediments and worn away (eroded) by wind and water.
- These little pieces flow along in rivers and streams or blow over the land with the wind and settle in a new place.
- As they settle, they pile up and form layers.
- After long periods of time, the pieces become pressed together and form solid rock called sedimentary rock.
- Sedimentary rocks are usually formed in water.
- Sedimentary rocks are found all over the world.
- Many fossils are found in sedimentary rock.
4th Grade Science Curriculum Units1st Marking Period2nd Marking Period3rd Marking Period4th Marking PeriodEarth's CrustElectricity, Magnetism & EnergyLife Science - Characteristics ofChemistry and PhysicsContentContentContentContentRocks Minerals Soil FossilsRivers Lakes GlaciersErosion Weathering LandslidesVolcanic Eruptions EarthquakesMagnetism Static ElectricityDevices that show electricity producing heat, light, sound and magnetic effectsTransfer of heatLiquidSoundNatural and renewable resourcesFood ChainAnimal NeedsAnimal Structure and FunctionClassify OrganismsLife StageHealth Related Topics / Body SystemsDigestive Circulatory RespiratoryNervousSkeletalMuscularUse magnification to sort materialsPhysical ChangesChemical ChangesProperty of Materials
- Metamorphic rocks are rocks that have changed from one form to another.
- These rocks form deep in the earth where the it is very hot and there is a lot of pressure.
- If a rock is heated and squeezed for millions of years, it can turn into a new kind of rock.
Metamorphic rocks begin to form at 12-16 kilometers (7.5 - 10 miles) beneath the surface of the earth.
The heat in the earth comes from Magma and the pressure comes from layers of rock piled onto layers of rock.
- The layers on the bottom get squeezed and the thicker the layers the more pressure or the more they get squeezed.
Follow the link below to learn about different landform types
All about Topography Maps - A Powerpoint Presentation
How Rocks are FormedSedimentary Rock
Water moves bits and pieces of rock, which sink and settle. As they pile up, they're pressed into rock
The heat of the earth melts rock into a liquid that hardens into different rocks when it cools.
Heat and pressure change sedimentary and igneous rocks into new rock.
Forms from pressed and cemented layers of shell
Forms when gas-filled melted rock cools quickly
Forms when limestone is put under great pressure
Forms from pressed and cemented layers of mud
Forms when melted rock cools quickly in air or water
Forms when shale is put under great pressure
Forms from pressed and cemented layers of sand
Forms when melted rock cools slowly underground
Forms when sandstone is put under great pressure
Our first unit of study is Landforms