Weathering and Erosion and Sedimentary Rocks Push the arrow keys on your keyboard to hear my voice

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

Sedimentary Those 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

Sedimentary There are two main types: Well sorted Poorly sorted

Sedimentary Well sorted Poorly sorted

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

Mud (or silt) can be cemented to form shale. Sedimentary Mud (or silt) can be cemented to form shale.

Gravel can be cemented to form breccia. Sedimentary Gravel can be cemented to form breccia.

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

This is an example of a poorly sorted sedimentary rock.

Landslide debris can be cemented together to form conglomerate rocks Sedimentary Landslide debris can be cemented together to form conglomerate rocks

Well sorted or Poorly sorted? Sedimentary Well sorted or Poorly sorted?

Well sorted. The particles are all the same size Sedimentary Well sorted. The particles are all the same size

Well sorted or poorly sorted? Sedimentary Well sorted or poorly sorted?

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

Well sorted, or poorly sorted? Sedimentary Well sorted, or poorly sorted?

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

Well sorted, or poorly sorted? Sedimentary Well sorted, or poorly sorted?

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

Sample Test Question… A sample of rock has visible small, round pebbles cemented together with smaller- grained material. Which type of rock is the sample? A. igneous B. sedimentary C. metamorphic D. Not enough information to answer.