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10.4 Water Shaping the World

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Jesse Guo

on 5 June 2013

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Transcript of 10.4 Water Shaping the World

Chapter 10.4: Water's Effect on Shaping the Earth's Surface What you're witnessing is a karst A karst is an area of land that has or had limestone in it, and contains sinkholes, fissures, ridges, and other formations. This is caused by limestone reacting with acid rain. When acidic liquid
touches limestone, a
base material
calcium carbonate,
it creates
lots of fizzing, much like
when vinegar is poured
into baking soda. The acidic reaction causes
the limestone to become easily
soluble in water, and since
acid rain is acidic(hence acid rain),
and contains water(rain), it
basically wrecks the limestone. What is Acid Rain? You're probably wondering that right now.
pH is a way to measure acidity/alkalinity in liquids, and 7 is the middle child of the scale.
Lower than 7 is acidic, and more is alkaline.
Usually, rain is leaning on the acid side, but no less than a pH of 5.7
However, acid rain can be much worse, sometimes as acidic as 2pH! Acid rain's reaction with calcium carbonate is a form of chemical weathering.
Chemical weathering is when rocks change their composition. This is a gradual process as the minerals in the
rock adjusts to the near surface environment.
This is different from physical weathering. Physical weathering is when rocks breakdown but their chemical
composition stays the same, effectively becoming a smaller rock. Glacial Striations Glacial striations are streaks left in the ground
by glaciers that have passed over that area, the sand and gravel under it grinding into the ground.
Usually, they're smooth and straight lines. These markings can show us how a glacier has spent its lifetime, revealing things like which direction it was traveled. Notice anything? Glacial striation is a form of physical weathering! The more you know!
Also, take a look here, for conversation between a zebra and an elephant!
http://goanimate.com/videos/0Bs2tzXw5Ac8 How does gravity come into play here? Gravity pulls things to the ground. Those things include glaciers, which
as you know, creates striations in the ground.
Gravity also causes rain to fall down and erode rocks and such.
Erosion is when water or wind move dirt or stone to
different places. Did you say something about water? Check out this awesome animation about rapids!
http://goanimate.com/videos/09MCgkPAb_9o While on the subject of water... Deltas are land forms where rivers flow into oceans, lakes, estuaries, etc. These form from.. weathering! What else can be formed by weathering? Caves! Caves are natural underground spaces that are big enough for a person to fit inside. Landslides are a form of erosion Gravity causes landslides to happen!
A landslide is a geological event
that moves a lot of rock and/or dirt
to fall, or "slide" down what is
usually a hill or mountain. Deposition has something to do with a landslide However, they're not quite the same. Deposition is when sediment, dirt, or rock is added to some other land. For example, a truck unloading dirt onto a hill. [This is a karst] (Duh, I just told you) Did you know... Besides striations, glaciers can also carve things like valleys, cliffs, and cirques.
What's so special about these? Well normal
valleys are formed in a V-shape. However, the
way a glacier moves creates a U-shaped
The cliffs that come from this process are strange too,
in that they have a triangular shape, known as
truncated spurs.
Cirques, what are those? Circus comes to mind. It looks
like how a circus would, being a large amphitheater type valley head. A valley head
being the beginning section of a valley.
It's generally bowl shaped and has rather
steep sides. More to know! When glaciers start dying off(melting,) the material
that has collected inside of it will be released. This can form things such as kames, eskers, moraines, and alluvial plains. Eskers are long, winding ridges of sediment, and are usually several kilometers long.
Kames are strangely shaped hills that are made of dirt and rock deposited by a melting glacier, similar to how eskers are formed.
Moraines are any glacially made debris landform. A picture is easier to understand how it looks; [A moraine] The end! Just kidding, video: Welcome! This Prezi is all about
how water shapes the land of the earth.
You'll learn about what glaciers and water can do to
break rocks down into magnificent landscapes.
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