https://padlet.com/2020559/c5vsu1f33woc Honors Earth Science en-us 2017-11-03 20:24:49 UTC 2023-05-29 21:16:12 UTC hello@padlet.com 2020559 https://padlet.com/2020559/c5vsu1f33woc/wish/203470738 Arches form as a result of a deep crack forming in a sandstone layer. These cracks get eroded, enlarging the surface cracks and forming narrow sandstone walls. More weathering erodes these small walls, eventually forming into large arches like the one seen below.]]> 2017-11-03 20:27:21 UTC https://padlet.com/2020559/c5vsu1f33woc/wish/203470738 2020559 https://padlet.com/2020559/c5vsu1f33woc/wish/203470769 There are a few theories on how pinnacles form. One of these theories is that these were originally places that contained voids from trees, which then filled up with harder rock than the surrounding. eventually, the softer surrounding rock eroded away, leaving only the harder rock, in the shape of pillars.]]> 2017-11-03 20:27:32 UTC https://padlet.com/2020559/c5vsu1f33woc/wish/203470769 2020559 https://padlet.com/2020559/c5vsu1f33woc/wish/203470781 These are small, chimney-like structure made out of rock. This forms where there are layers of soft rock are mixed in with layers of hard rock. The hard rocks get eroded, opening cracks that expose the much softer rocks to erosion. Hoodoos are formed when a part of this hard rock does not weather, forming a sort of cone where the softer rock is not weathered.]]> 2017-11-03 20:27:38 UTC https://padlet.com/2020559/c5vsu1f33woc/wish/203470781 2020559 https://padlet.com/2020559/c5vsu1f33woc/wish/203487143 This land form happens as a result of weathering and erosion. Wind blows the sand into these dunes, and the sand is formed with mechanical weathering, with abrasion breaking bigger rocks apart.]]> 2017-11-03 22:32:30 UTC https://padlet.com/2020559/c5vsu1f33woc/wish/203487143 2020559 https://padlet.com/2020559/c5vsu1f33woc/wish/204016216 Talus slopes are formed as a result of weathering and erosion breaking away debris from a steep slope, and that debris forming in a characteristic angle of repose. Whenever new debris was added, the debris will shift to maintain the same angle.]]> 2017-11-06 17:42:49 UTC https://padlet.com/2020559/c5vsu1f33woc/wish/204016216 2020559 https://padlet.com/2020559/c5vsu1f33woc/wish/204024541 V-shaped valleys can be formed wherever a river is present. The river erodes down into the ground, becoming deeper ad deeper. Then the sides of this new canyon are broken down by weathering, and get deposited into the river to be washed away, This happens until the sides no longer have material that will fall into the river, resulting in a v-like shape.]]> 2017-11-06 17:56:28 UTC https://padlet.com/2020559/c5vsu1f33woc/wish/204024541 2020559 https://padlet.com/2020559/c5vsu1f33woc/wish/204026745 Meandering streams are formed when fast-moving water moves from one side of a stream to another, in a meandering shape. This erodes down the sides of the river until it is in the meandering shape, and then sediments fill up where the previous, straight stream was.]]> 2017-11-06 18:00:35 UTC https://padlet.com/2020559/c5vsu1f33woc/wish/204026745 2020559 https://padlet.com/2020559/c5vsu1f33woc/wish/204030181 Ox-Bow lakes form when a meandering stream erodes, so that the two turns that form one of the off-circles of the meandering stream cone together to form one continuous stream, and the half-circle part gets blocked off, to form a sort of lake.]]> 2017-11-06 18:06:19 UTC https://padlet.com/2020559/c5vsu1f33woc/wish/204030181 2020559 https://padlet.com/2020559/c5vsu1f33woc/wish/204161790 Sinkholes form when water or another erosional force erodes away slightly soluble rock underneath the surface, gradually forming a void. Eventually, the roof of this void will collapse, due to pressure from overhead, creating the sinkhole.]]> 2017-11-06 23:43:46 UTC https://padlet.com/2020559/c5vsu1f33woc/wish/204161790 2020559 https://padlet.com/2020559/c5vsu1f33woc/wish/204620016 Caves form when rainwater or other water picks up carbon dioxide from the air and becomes a light acid when percolating through the rock. This erodes away the rock, which eventually becomes big enough to be a cave
Stalactites and stalagmites form when rainwater falling directly on to the limestone percolates down through the rock, gradually becoming saturated with calcium carbonate as it dissolves the limestone through which it passes. On reaching an open cave below, the calcium carbonate precipitates out to form stalactites and stalagmites.]]> 2017-11-07 22:47:29 UTC https://padlet.com/2020559/c5vsu1f33woc/wish/204620016 2020559 https://padlet.com/2020559/c5vsu1f33woc/wish/204621857 As glaciers expand, they crush abrade surface rocks and bedrock. Later, when the glaciers have retreated, they leave many abraded rocks behind, forming deposition glacial land forms, like the one seen below.]]> 2017-11-07 22:57:43 UTC https://padlet.com/2020559/c5vsu1f33woc/wish/204621857 2020559 https://padlet.com/2020559/c5vsu1f33woc/wish/204639001 Landslides form as a result heavy rainfall, which makes the rock and upper dirt layers softer, and then they slide off, creating landslides like the one below.]]> 2017-11-08 00:57:46 UTC https://padlet.com/2020559/c5vsu1f33woc/wish/204639001 2020559 https://padlet.com/2020559/c5vsu1f33woc/wish/204659657 https://docs.google.com/document/d/16JNIsY_3xWnPf2Bvd9wgUV7skvD9a8QLfhws_T3Vs7Q/edit?usp=sharing]]> 2017-11-08 03:10:16 UTC https://padlet.com/2020559/c5vsu1f33woc/wish/204659657