geomorphology & earth landforms section 9 MCQ Questions & Answers Detailed Explanation

Answer: (d)

A rift valley is a linear-shaped lowland between several highlands or mountain ranges created by the action of a geologic rift or fault. It is formed by the subsidence of a segment of the Earth’s crust between dip-slip, or normal, faults.

Answer: (a)

The interior of the Earth beneath the lithosphere, including both the mantle and the core, is known as barysphere. However, it is sometimes used to refer only to the core or only to the mantle.

Answer: (d)

Answer: (c)

Answer: (a)

Deserts take up about one third (33%) of the Earth’s land surface. Hot deserts usually have a large diurnal and seasonal temperature range, with high daytime temperatures, and low nighttime temperatures (due to extremely low humidity).

In hot deserts, the temperature in the daytime can reach 45 °C/113 °F or higher in the summer and dip to 0 °C/32 °F or lower at nighttime in the winter.

Answer: (d)

The heat that caused melting in the Earth’s early history was supplied from radioactivity and a large impact event.

It appears that the Earth formed through a series of collisions with other growing objects in the solar disk, a number of which had iron cores. Each collision added iron to the core and produced a magma ocean.

The only substantial heat sources for the Earth are from the decay of radioactive elements and heat from the giant impacts of accretion. Because Earth’s radioactive elements are concentrated near the surface, heat from the source is rapidly dissipated and does not accumulate.