Chapter 2, Problem 2.1P

(a)

To determine

Whether the statement “Aeolian soils are transported and deposited by wind” is true or false.

Answer to Problem 2.1P

The statement “Aeolian soils are transported and deposited by wind” is true.

Explanation of Solution

• • The classification of soil is based on the transportation. Aeolian soils consist of sand or silt sized particles.
• • This type of soil is normally transferred from one place to another place through the wind. Soils are divided into groups based on their mode of transportation.

Hence, the statement is True.

(b)

To determine

Whether the statement “Marble is an igneous rock” is true or false.

Answer to Problem 2.1P

The statement “Marble is an igneous rock” is false.

Explanation of Solution

• • Marble is a metamorphic rock that forms when limestone is subjected to heat and pressure from all sides.so, marble are not classified as an igneous rock.

Hence, the statement is False.

(c)

To determine

Whether the statement “Sandstone is a sedimentary rock” is true or false.

Answer to Problem 2.1P

The statement “Sandstone is a sedimentary rock” is true.

Explanation of Solution

• • Sandstone is a clastic sedimentary rock.
• • It’s composed of rock, organic material, and sand size grains of mineral.

Hence, the statement is True.

(d)

To determine

Whether the statement “Silts have no plasticity” is true or false.

Answer to Problem 2.1P

The statement “Silts have no plasticity” is true.

Explanation of Solution

• • It is termed as very fine particles of sand, and it is carried by moving water and deposited as sediment.
• • The particles of silt are very fine and it does not have plasticity at all.

Hence, the statement is True.

(e)

To determine

Whether the statement “$D_{30}$ is always greater than $D_{10}$” is true or false.

Answer to Problem 2.1P

The statement “$D_{30}$ is always greater than $D_{10}$” is true.

Explanation of Solution

• • $D_{30}$ is the size of sieve hole in which 30% of soil will passes through them and $D_{10}$ is the size of sieve hole in which 10% of soil will passes through them.
• • The soil $D_{30}$ is equal to or greater than $D_{10}$ in sieve analysis.

Hence, the statement is True.