Water Shaping Rock & Land L.O: To know how water can shape both rocks and the land Rock Cycle Look at the rock cycle below New rock formation Weathering ErosionTransport Deposition clues A, B, C & D each represent part of the cycle: can you work out which Rock Cycle A Rock particles are moved to new places by flowing water, strong winds etc Fallen parts of the cliff faces are moved along by the sea B Water enters crevices in the rock, and ice forms expanding the crevices causing pieces to break off. Acid rain reacts with rock, which becomes weaker. Heat/cold expansion and contraction causes heat stresses breaking the rock. Wind causes loose particles to blast against rocks, wearing them away C Loose surface particles are worn away by rain, wind, rivers and sea. Channels in the ground are cut out by torrents of rain water, wearing away rock formations D Layers of particles which have been deposited are crushed from the weight of layers above. Water is forces out of each layer, so that the layers cement together in a solid rock E Particles fall due to gravity forming sediment. In water the most dense particles fall to the bottom first, followed by the less dense particles. Layers of different sediments form D EB CA Rock Cycle New rock formation Weathering ErosionTransport Deposition D EB CA The story of a weathered rock One day Rockette the rock was weathered she was weathered mostly by physical weathering (the wind, rain and temperature changes); this caused her to break away from her family the larger piece of rock. Erosion When Rockette was eroded she fell down the cliff away from where she broke off Transportation Rockette fell into a river then a smaller stream which moved her this is transportation She got a bit battered and broken on her way through the water caused more erosion.. What happens to rocks during transportation? Imagine that the pieces of plaster are pieces of rock. You will shake them in a jam jar like a river would bash them about transporting them Make a prediction to describe what you think will happen to the plaster as you shake the jar. Transporation As she was quite a large piece of rock she wasnt transported very far and needed fast flowing water to move her Fast flowing rivers can transport large rocks, but slow moving rivers can only transport tiny pieces of rock Deposited Finally Rockette was deposited when the river did not have enough energy to carry to carry her any more Some of her friends got taken further down the river why was this? Deposition Which rocks are likely to be deposited first very large or very small rocks? Watch the deposition demo Very large rocks need a huge amount of energy to carry them as the river slows energy is lost causing the large rocks to be deposited first The river basin Can you use the cards to put the different sized rocks into the correct order in the river basin? Think about where the different sized pieces get deopsited. Now write a story for your own piece of rock, you can give it a name but it must be a small rock unlike Rockette. Start from weathering and finish at deposition. How do glaciers affect the landscape?nk?macro=setresource&template=vid&res ourceID=946http://espresso/espresso/clipbank/servlet/li nk?macro=setresource&template=vid&res ourceID=946 Plenary Can you match the rock formations to their locations and what caused the weathering/erosion? Mississippi River The Mississippi River carries 550 million tonnes of sediment each year, deposited into the Gulf of Mexico this builds the coast outwards by ~90m per year! Where would you expect the largest rocks to be deposited at (A, B or C)? Explain your answer Largest rocks would be deposited at A (as this point where the river still just had enough energy to move them) A B C