1 / 20

EPIC WEATHERING AND EROSION REVIEW FOR 6TH GRADE LET'S GOOOOO

This review covers the processes of weathering and erosion, including mechanical and chemical weathering, as well as how rocks are formed and transformed in the rock cycle.

lmarc
Download Presentation

EPIC WEATHERING AND EROSION REVIEW FOR 6TH GRADE LET'S GOOOOO

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. EPIC WEATHERING AND EROSION REVIEW FOR 6TH GRADE LET'S GOOOOO

  2. What even is a rock? • Elements + chemical compounds → hard, solid materials of Earth's surface • Minerals • Elements and compounds found in rocks • All minerals are solid

  3. Weathering • chemical or mechanical • breaking down of rocks by exposure to air, moisture, organic materials • small-scale, local changes on rocks

  4. Mechanical/Physical Weathering • breaks rocks into smaller pieces without changing them chemically • frost wedging, plants, animals, gravity

  5. Frost Wedging • Water seeps into cracks in rock and freezes • When water freezes, it expands and breaks the rock

  6. Living Organisms • Growing roots put pressure on rock • Burrowing loosens and weakens rock

  7. Gravity • Exposes new surfaces for physical and chemical weathering • Avalanches, rock slides

  8. Chemical Weathering • decomposition of rock due to chemical reactions between rock and chemicals in the environment • changes chemical composition of rock • materials acted upon

  9. Chemical Weathering, cont'd • natural acids and oxygen • water + carbon dioxide = carbonic acid • acid rain – caused by pollution • sulfur released into air by factories, combines with water

  10. Erosion • rock and soil materials are loosened and transported from one place to another • KEY = MOVEMENT • large-scale changes over great distances • From canyons and valleys all the way to • deltas and sand dunes

  11. Wind • sand grains carried by strong winds act like sandpaper • scrape away little pieces of rock and soil from hills and mountains • can pick up soil from plants or fields and transport to other areas

  12. Water • Runoff: water that flows over Earth's surface • Carries sediment, soil → eroding land

  13. Water, cont’d • Three factors influence amount of water erosion: • Rainfall intensity and runoff – more rain, more erosion • Steepness of slope – steeper slope, more erosion • Vegetation/obstacles – more rocks and plants, less erosion

  14. Soil • mixture of weathered rock, organic matter, and water • sand, gravel, humus • end result of weathering and erosion • humus - organic component of soil • comes from decomposing plant and animal • material

  15. Structure of Earth • Crust: surface of Earth • Mantle: semi-solid middle layer • Convection currents in mantle cause movement of tectonic plates • Core: middle of Earth, iron and nickel • Extreme heat and under extreme pressure

  16. Convection Currents • Convection currents: hot material rises and cool material sinks • CC in the mantle force materials up onto the Earth’s crust • Creates new crust, pushing tectonic plates into one another • This causes continental drift!

  17. Rock Types • Igneous rock: formed by the cooling of lava or magma • Sedimentary rock: rock formed when sand, mud, and pebbles are deposited on top of each other • Layers squashed into each other until they form rock • Metamorphic rock: changed • by extreme heat and pressure

  18. Steps 1-3 of the Rock Cycle • Molten rock from the mantle rises to the surface and creates new crust • - This molten rock cools and forms igneous rock • As a result of weathering, rock breaks down • Over time, broken down rocks are layered on top of each other to form sedimentary rock

  19. Steps 4-7 of the Rock Cycle • As more and more rock builds up, pressure and temperature • increase a lot • This increased pressure and temperature form metamorphic rock • Metamorphic rock sinks into the mantle and melts into • magma, becoming part of the mantle • Through convection, the magma is pushed back up to • the surface and creates new igneous rock • AND THE CYCLE REPEATS

  20. Rock Cycle Diagram

More Related