Weather and Erosion and Sedimentary Rocks

Weathering and Erosionand Sedimentary RocksPush the arrow keys on your keyboard to hear my voice

Weathering and ErosionWhat happens to a rock that has been rained on for HUNDREDS of years?What about a rock that has had STRONG winds blowing on it for hundreds of years?What about TWO rocks that have been grinding against each other for hundreds of years?

Weathering and ErosionWe call the process of rocks wearing down WEATHERING.

Weathering and Erosion

What do you think happened to these rocks?

Weathering and Erosion

What do you think happened to these rocks?

Weathering and Erosion

What do you think happened to this rock?

Weathering and Erosion

What do you think happened to this rock?

Weathering and Erosion

What do you think happened to this rock?

Weathering and Erosion

Weathering usually happens when something slowly SQUEEZES AND PUSHES its way into a rock.

This type of weathering can be caused by water, ice, or plant roots.

Weathering and ErosionErosion is the process of TRANSPORTING and DEPOSITING small pieces of rock and soil in a new location.

SedimentaryThose small pieces of rock can be glued together to form sedimentary rock.The cement that holds sediments together are actually MINERAL CRYSTALS, usually from groundwater.

Sedimentary

SedimentaryThere are two main types:Well sortedPoorly sorted

Sedimentary

Well sortedPoorly sorted

Sedimentary

Well sortedWhere have you seen well sorted particles and pieces of rock before?

Sedimentary

Sand, like in a desert, can become sandstone after millions of years of cementation

SedimentaryMud (or silt) can be cemented to form shale.

SedimentaryGravel can be cemented to form breccia.

Sedimentary

Can you think of somewhere you have seen poorly sorted rocks?Poorly sorted

SedimentaryThis is an example of a poorly sorted sedimentary rock.

SedimentaryLandslide debris can be cemented together to form conglomerate rocks

Sedimentary

Well sorted or Poorly sorted?

Sedimentary

Well sorted. The particles are all the same size

Sedimentary

Well sorted or poorly sorted?

Sedimentary

Poorly sorted. The particles in this rock are all different sizes

Sedimentary

Well sorted, or poorly sorted?

Sedimentary

Well sorted. The particles in this rock are all very small

Sedimentary

Well sorted, or poorly sorted?

Sedimentary

Poorly sorted. There are very large and very small particles in this rock

Sample Test QuestionA sample of rock has visible small, round pebbles cemented together with smaller-grained material. Which type of rock is the sample?A. igneousB. sedimentaryC. metamorphicD. Not enough information to answer.