what portion of an angular, fracture-bounded granitic block shows the highest rate of weathering?

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What area of an angular fracture-bounded granitic block shows the highest rate of weathering?

What portion of an angular, fracture-bounded granitic block shows the highest rate of weathering? The edges and corners.

What has the greatest effect on weathering rates?

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

What 2 factors determine the rate of weathering?

What are two factors that affect the rate of weathering? The most important factors that determine the rate at which weathering occurs are the type of rock and the climate.

In which area would weathering by frost wedging be most effective?

Frost wedging is the process by which water seeps into cracks in a rock, expands on freezing, and thus enlarges the cracks (Figure 5.5). The effectiveness of frost wedging is related to the frequency of freezing and thawing. Frost wedging is most effective in a climate like Canada’s.

Why does limestone and marble weather faster than granite?

Rock and Mineral Type

Certain types of rock are very resistant to weathering. Igneous rocks, especially intrusive igneous rocks such as granite, weather slowly because it is hard for water to penetrate them. Other types of rock, such as limestone, are easily weathered because they dissolve in weak acids.

Are the particles in breccia primarily silt sized?

10)The particles in breccia are primarily silt sized.

How does the surface area affect the rate of weathering?

How Does a Rock’s Surface Area Affect Weathering? Most chemical weathering takes place only on the outer surface of a rock. Therefore, rocks with a lot of surface area weather faster than rocks with little surface area. … In the same amount of time, the smaller rocks weather more and become much smaller.

How does the surface area affect the rate of weathering explain?

How does surface area affect the rate of weathering? When the amount of surface area relative to volume increases, the rate of weathering increases. … weathered it can increase the surface area of the rock. This means that more of the rock is exposed to chemical weathering.

In what environment would weathering rate be fastest?

wet climates
CLIMATE: The amount of water in the air and the temperature of an area are both part of an area’s climate. Moisture speeds up chemical weathering. Weathering occurs fastest in hot, wet climates.

How would increased rainfall most likely affect the rate of weathering in an area?

How would increased rainfall most likely affect the rate of weathering in an area? Increased groundwater flow would increase the number of hydration and carbonation reactions involving the area’s rocks, so weathering would increase. … The roots secrete acids that react with and transform minerals in the ground.

What is the rate of weathering?

The weathering rate for rocks depends on the composition of the rock; the climate of the area; the topography of the land; and the activities of humans, animals, and plants. A rock’s composition has a huge effect on its weathering rate. Rock that is softer and less weather-resistant tends to wear away quickly.

What are the 4 factors that the rate of weathering depends on?

Key Concept The rate at which rock weathers depends on climate, elevation, and the size and makeup of the rock. Differential weathering is the process by which softer rocks weather more rapidly than harder rocks do. Surface area, climate, and elevation are factors that affect the rate at which rock weathers.

Is frost wedging mechanical weathering?

Frost weathering is a collective term for several mechanical weathering processes induced by stresses created by the freezing of water into ice. The term serves as an umbrella term for a variety of processes such as frost shattering, frost wedging and cryofracturing.

Where does frost wedging occur?

Frost wedging is a form of physical weathering that involves the physical breaking of a rock. It typically occurs in areas with extremely cold conditions with sufficient rainfall. The repeated freezing and thawing of water found in the cracks of rocks (called joints) pushes the rock to the breaking point.

How root wedging affects the weathering process?

The effects of plants are significant in mechanical weathering. Roots can force their way into even the tiniest cracks. They exert tremendous pressure on the rocks as they grow, widening the cracks and breaking the rock. This is called root wedging (Figure 8.7).

What weathers faster granite or marble?

In an arid, temperate climate, mechanical weathering in the form of abrasion from windblown sand might be more prevalent than in a humid, temperate climate. This would lead to more mechanical weathering of marble than of granite because of the differences in the hardness of their constituent minerals.

How long does it take for granite to weather?

Granitic and gneissic domes in the humid southeastern United States appear to eroding at about 10 m/My. Our data suggest that granite, exposed in a variety of tectonic and non-glacial climatic settings, erodes quite slowly — on the order of a meter to perhaps a few tens of meters in a million years.

How is granite mechanically weathered?

Wind. Wind, water and ice denude the soil and Earth’s crust overlying the granite mass, exposing it to the atmosphere. The rock expands and contracts in reaction to changes in temperature. It shatters on the surface and the fractures widen to form crevices.

What are the names of the grain sizes of sediment in order from the largest to the smallest grains?

The size classes used to describe clastic sedimentary rocks are, from smallest to largest: clay and silt (mud size); fine and coarse (sand size); pebbles, cobbles, and boulders (gravel size).

Which of the following has the highest specific gravity?

Osmium has the highest Specific Gravity among minerals approved by the IMA, ice has the lowest.

What produces the largest quantity of metamorphic rock?

The largest quantity of metamorphic rock is produced by contact metamorphism. Metamorphism is commonly associated with mountain building.

What is the most likely cause of a sediment with highly rounded grains?

What is the most likely cause of a sediment with highly rounded grains? Longer distance transported; The longer the distance, the more the rounding.

How does the surface area of the rock and temperature affect weathering?

Surface area — if the rock is broken down into small pieces, it undergoes chemical weathering more readily than does one large piece. Smaller pieces have more surface area for water and gases to react with the rock. Mechanical weathering is effective at increasing surface area.

How can increasing the surface area of rock hasten or speed up the process of weathering?

Mechanical weathering increases the overall surface area when it breaks down the rock into smaller fragnments. Increased surface area provides more surface for chemical weathering to attack the rock, allowing chemical weathering to speed up.

How does the amount of exposure of a material affect the amount and rate of weathering that occurs?

Weathering wears away exposed surfaces over time. The length of exposure often contributes to how vulnerable a rock is to weathering. Rocks, such as lavas, that are quickly buried beneath other rocks are less vulnerable to weathering and erosion than rocks that are exposed to agents such as wind and water.

What is the correlation between surface area and rate of weathering quizlet?

What is the correlation between surface area and rate of weathering? The greater the surface area, the more rock is exposed so the faster the weathering.

When surface area of a rock is increased?

When surface area of a rock is increased, the rock is less vulnerable to chemical weathering. the rock is less vulnerable to physical weathering. the rock weathers less rapidly because fewer surfaces are exposed.

In what climates is the weathering rate slowest?

The slowest rates of weathering occur in hot, dry climates. The lack of water limits many weathering processes, such as carbonation and ice wedging.

In which of these places is chemical weathering most rapid?

Chemical weathering is most rapid in hot and wet places like the tropics.

Which type of climate would cause the greatest rate of weathering?

In general, hot wet climates accelerate chemical weathering while cold dry climates accelerate physical weathering. Although the rate of weathering depends on the type of rock, rocks in tropical climates experience the highest rates of weathering because of the combination of high heat and heavy rainfall.

How does rainfall affect weathering?

Rainfall and temperature can affect the rate in which rocks weather. High temperatures and greater rainfall increase the rate of chemical weathering. … Minerals in a rock buried in soil will therefore break down more rapidly than minerals in a rock that is exposed to air.

Why is weathering slow in cold dry places?

Why is weathering slow in cold dry places? Rate of weathering depends on temperature and moisture. Cold dry places have less water to weather things.

How does climate influence the weathering of rock quizlet?

How does climate influence the weathering of rock? Areas with high temperatures and abundant moisture will generally have the highest rates of chemical weathering. … Unlike regolith, which consists only of weathered rock and mineral fragments, soil also contains organic matter, water, and air.

What are the 4 weathering rates?

7.4. 5.3 Specific Mineral Weathering Rates
Weathering environmentRate (mol m 2 s 1)Roughness (λ)
47 Plastic Lake, ON, Canada− 12.3 (− 14.2)1
48 Rio Icacos, Puerto Rico− 12.2nd
Biotite
49 Panola, GA, USA− 16.5775

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