Theory of Isostasy

Options:

1. Density remains uniform both above and below the level of compensation
2. Density varies both above and below the level of compensation
3. Density varies above the level of compensation but remains uniform below it
4. Density varies below the level of compensation but remains uniform above it

Correct Answer

Options:

1. Joly believed that the level of compensation is a linear phenomenon while Hayford and Bowie believed it is a zonal phenomenon
2. Joly believed that the level of compensation is a zonal phenomenon while Hayford and Bowie believed it is a linear phenomenon
3. Joly and Hayford and Bowie had the same concept of the level of compensation
4. Joly and Hayford and Bowie had contradictory views on the level of compensation

Correct Answer

Options:

1. Because they are made of heavier materials
2. Because they are supported by lighter material below them for greater depth
3. Because they have a smaller surface area
4. Because they are not subject to geological events

Correct Answer

Options:

1. 25 km
2. 50 km
3. 75 km
4. 100 km

Correct Answer

Options:

1. Through a diagram of four columns of equal cross-section
2. Through a diagram of the earth's magnetic field
3. Through a diagram of the earth's tectonic plates
4. Through a diagram of the earth's mantle

Correct Answer

Options:

1. By measuring the surface area of each column
2. By multiplying the density and corresponding thickness down to the depth of 50 km
3. By measuring the pressure on the underlying mantle
4. By calculating the total weight of each column

Correct Answer

Options:

1. Through a diagram of the earth's tectonic plates
2. Through a diagram of the earth's mantle
3. Through a diagram of the earth's magnetic field
4. Through a diagram of characteristic examples of crustal columns with the same area and extending downward to the same depth below sea-level

Correct Answer

Options:

1. Due to sudden climatic changes at an extensive global scale
2. Because of geological forces coming from within the earth
3. Due to disagreement among the scientists about the nature of isostasy
4. All of the above

Correct Answer

Options:

1. The mountainous area becomes heavier and the oceanic floor becomes lighter
2. The oceanic floor becomes heavier and the mountainous area becomes lighter
3. The state of balance or isostasy between the two areas is not disturbed
4. None of the above

Correct Answer

Options:

1. Exogenetic forces
2. Climatic changes
3. Endogenetic forces
4. Sedimentation

Correct Answer

Options:

1. Through the removal of sediments from the oceanic floor
2. Through the flowage of heavier materials from the substratum towards the rising column of the mountain
3. Through the deposition of sediments on the oceanic floor
4. Through the removal of materials from the mountainous area

Correct Answer

Options:

1. The state of isostatic balance is maintained
2. The process of isostatic adjustment through the flowage of materials from the substratum is not maintained
3. The mountainous area becomes heavier
4. The oceanic floor becomes lighter

Correct Answer

Options:

1. Release of pressure of superincumbent thick load of ice sheets
2. Accumulation of thick ice sheets on the land surface
3. Climatic changes at a global scale
4. Endogenetic forces

Correct Answer

Options:

1. One feet per year
2. One feet per 28 years
3. 900 feet per year
4. 900 feet per 28 years

Correct Answer