Earth Science

The atmospheric greenhouse effect occurs primarily because certain gases in the atmosphere absorb and re-emit infrared radiation emitted by the Earth's surface, trapping heat and warming the planet. Visible and ultraviolet light are mostly absorbed or reflected differently and do not contribute directly to the greenhouse effect.

The term 'perihelion' refers to the point in Earth's orbit when it is closest to the Sun. 'Aphelion' is when Earth is farthest from the Sun, while 'apoapsis' and 'periapsis' are general terms for the farthest and closest points in any orbit, respectively.

Stratocumulus clouds typically form at lower altitudes compared to cirrostratus, altocumulus, and cirrus clouds. Therefore, in middle latitudes, stratocumulus clouds have the lowest cloud base among the options given.

An ice mass covering more than fifty thousand square kilometers is classified as an ice sheet. Ice caps are smaller, and ice fields and glacier erosions do not refer to such large continuous ice masses.

The pedosphere is defined as the outermost layer of the Earth that includes the soil and all living organisms within it, as well as the physical, chemical, and biological processes linking the lithosphere, biosphere, atmosphere, and hydrosphere. It encompasses soil, organisms, air, and water in the near-surface environment. Therefore, the most accurate answer among the options is 'D' (All of above).

The atmosphere near the Earth's surface is primarily heated from below through conduction, convection, and absorption of infrared radiation emitted by the surface. Heat energy from the Earth's interior is negligible in heating the atmosphere compared to these processes.

Sedimentary rocks are formed by the accumulation and compaction of layers of sediment bonded together over time, distinguishing them from metamorphic and igneous rocks.

The central part of the Earth is called the Core, which lies beneath the mantle and crust. It is composed mainly of iron and nickel and is divided into the inner and outer core.

Approximately 30% of the Sun's energy reaching the Earth is reflected back into space by the Earth's atmosphere, clouds, and surface, which is known as Earth's albedo. This reflection helps regulate the planet's temperature.

The Earth's atmosphere is divided into layers based on temperature gradients. The second layer from the Earth's surface is the stratosphere, which lies above the troposphere and below the mesosphere.