what are the factors that influence the rate of weathering and erosion. in about 100 words
Answers
Weathering
Weathering is the mechanical or chemical process by which rocks are broken down. The weathering that happens to rocks can be understood by relating it to the digestion of a chocolate chip cookie. When you bite into and chew a chocolate chip cookie, your teeth mechanically break the cookie down into smaller pieces. Your mouth also produces saliva, which contains enzymes that chemically mix with the cookie pieces, breaking them down even further.
The physical elements in nature, such as wind, water, cold and heat, physically chip away at rocks, just like your teeth chipped away at your cookie. Chemical reactions involving water, acids, and certain atmospheric gases mix with the minerals within rocks and break them down, much like saliva acting on your cookie. Now that you have a better understanding of what weathering means, let's take a look at factors that affect the rate at which weathering happens.
Exposure to the Atmosphere
One factor that influences the rate at which rocks will weather is their degree of exposure to the atmosphere. Rocks that are covered by ground are relatively protected from the environmental elements that tend to mechanically weather rocks, such as wind, water and day-night temperature fluctuations.
As rocks get uncovered and become more exposed to the atmosphere, cracks within the rocks widen due to the expansion of ice that freezes within the cracks and plant roots that grow into the cracks and break apart the rocks. These widened cracks provide more surface area where chemical weathering can occur, further accelerating the weathering rate.
Composition of Rock
Another factor that affects the rate of weathering is the composition of rock. Rocks seem like a pretty basic structure, but in reality, we see that most rocks are composed of a variety of minerals. Minerals are solid substances found within rocks that have their own distinct chemical composition. Minerals that are most reactive when mixed with water, oxygen or other elements will weather more rapidly.
For example, some rocks contain the mineral iron. Iron reacts with oxygen to form iron oxide, which you know as rust. If you have ever had a rusty car, you know that rust is not very strong. In fact, with very little pressure, you could poke your finger through a patch of rust. We see the same thing happens in rocks. The presence of iron in rocks causes them to weather more quickly and break apart more easily.
Explanation:
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Explanation:
1. People tend to amassl possessions, sometime being aware of doing so. Indeed they can have a delightful surprise when they find something useful, which they did not know they owned. Those who never have to change house become indiscriminate collectors of what can only be described as clutter. They leave unwanted objects in drawers, cupboards and attics for years, in the belief that they may one day need just those very things. As they grow old, people also accumulate belongings for two other reasons, lack of physical and mental energy, both of which are essential in turning out and throwing away and sentiment. Things owned for a long time are full of associations with the past, perhaps with the relatives who are dead, and so they gradually acquira a value beyond their true worth.
2. Something is collected deliberately in the home in an attempt to avoid waste. Among these, I would list string and brown paper, kept by thrifty people when a parcel has been opened, to save buying these two requisites. Collecting small items can easily become a mania. I know someone who always cuts out from newspapers sketches of model clothes that she would like to buy, if she had the money. As she is not rich, the chances that she will ever be able to afford such purchases are remote. But she is never sufficiently strong minded to be able to stop the practice. This is a 'harmless habit', but it litters up her desk to an extent that every time she opens it, loose bits of paper fall out in every direction.
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