Question: What Type Of Rock Is Least Resistant To Weathering?

What weathering affects granite?

Chemical weathering of granite occurs when dilute carbonic acid, and other acids present in rain and soil waters, alter feldspar in a process called hydrolysis..

Why do silicate minerals turn to clay at the surface?

The most important aspect of the smectite group is the ability for H2O molecules to be absorbed between the T-O-T sheets, causing the volume of the minerals to increase when they come in contact with water. Thus, the smectites are expanding clays.

Which event is the best example of erosion?

Which event is the best example of erosion? (1) shale breaking apart as water freezes in its cracks (2) dissolving of limestone to make a cave (3) a pebble rolling along the bottom of a stream (4) bedrock crumbling to form a residual soil.

What is the most important agent of chemical weathering?

WaterWater is the most important agent of chemical weathering. Two other important agents of chemical weathering are carbon dioxide and oxygen.

Which lasts longer granite or marble?

Granite is a much harder material and lasts considerably longer than marble. Marble is softer and will likely deteriorate over time by cracking, chipping, and eroding, especially in outdoor elements.

Is Marble resistant to weathering?

Marble is composed of calcite, a mineral strongly resistant to weathering, whereas granite is composed of quartz, a mineral strongly reactive in water. Marble is composed of a mineral that is resistant to chemical weathering (quartz), whereas granite is composed of minerals less resistant to weathering (like calcite).

Which layer is most resistant to weathering?

(2) The surface layer contains many fossils. (3) The surface layer is more resistant to weathering than the other layers. (4) The surface layer is older than the rock layers below.

What are some factors that cause rocks to be resistant to weathering?

Weathering breaks down rock through mechanical or chemical processes. Different types of rock have different resistance to weathering, but many other factors besides basic mineral content influence weathering rates, including climate.

What mineral is most resistant to chemical weathering?

quartzNot only is quartz the most stable of the common rock forming minerals in chemical weathering, its high hardness and lack of cleavage make it quite resistant to mechanical weathering.

What can speed up weathering?

Rainfall and temperature can affect the rate in which rocks weather. High temperatures and greater rainfall increase the rate of chemical weathering. 2. Rocks in tropical regions exposed to abundant rainfall and hot temperatures weather much faster than similar rocks residing in cold, dry regions.

Is Clay resistant to erosion?

Sediments with more clay contents tend to be more resistant to erosion than those which are composed mainly of sand or silt. The clay binds soil particles together.

In which climate is chemical weathering most effective?

1) Chemical Weathering: Most intense in warm, humid climate. Very little in cold, dry climates. Many minerals are not stable at earth surface conditions. They react with surface waters, atmospheric gases, and dissolved compounds (acids) and form a new set of minerals.

What mineral is least resistant to weathering?

So it makes sense that isolated tetrahedra are the least stable in weathering, while quartz, which is completely formed of interlocking silica tetrahedra with no intervening cations, is the most stable.

Which rocks are the hardest?

Diamond is the hardest known mineral, Mohs’ 10.

Is bedrock weathering resistant?

Not all types of bedrock are equal when it comes to weathering. … Generally igneous rocks (like granite) are composed of minerals resistant to weathering (like quartz). Sedimentary rocks (like shale) are less resistant to weathering because exposure to water dissolves minerals holding them together (like carbonates).

What are 4 factors that affect weathering?

Factors such as surface area, rock composition, and location influence the rate of weathering. water, the faster the rock will break down. A greater surface area allows chemical weathering to affect more of a rock.

Can you have weathering without erosion?

Without weathering, erosion is not possible. Because the two processes work so closely together, they are often confused. … Weathering is the process of breaking down rocks. Whereas, erosion is moving the sediment away from the original location.

What rock is most resistant to weathering?

SandstoneSandstone is a sedimentary rock that is highly resistant to weathering. Other sedimentary rocks you will encounter are mudstone and siltstone.