Earth Science

Sedimentary rocks are typically porous because they are formed by the accumulation of sediments, which often leave spaces or pores between grains. This porosity distinguishes them from many igneous or metamorphic rocks.

Oxygen makes up about 50% of the Earth's crust by weight, and it is also a major component of the Earth's waters and atmosphere, making it the most abundant element in these combined components.

The Earth's position in its orbit when it is farthest from the Sun is called Aphelion, which occurs around early July and coincides with the northern hemisphere's summer. This is why option A is correct.

Radium is a rare and radioactive element that is not abundant in the Earth's crust, unlike silicon, aluminum, and carbon which are common elements found in significant amounts.

Approximately 71% of the Earth's surface is covered by water, primarily oceans, seas, and other bodies of water. This is a well-established scientific fact.

Igneous rocks form from the cooling and solidification of molten material (magma or lava) within or on the Earth's surface. This distinguishes them from sedimentary rocks, which form from sediment deposition, and metamorphic rocks, which form from existing rocks under heat and pressure.

Oxygen is the most abundant element in the Earth's crust, making up about 46% by weight, primarily combined with other elements such as silicon and aluminum.

The outermost layer of the Earth is called the crust. It is the thin, solid surface layer on which we live, distinct from the underlying mantle and core.

The stratosphere extends approximately from 17 km to 50 km above the Earth's surface. Among the given options, 17 km to 35 km is the closest and most accurate range for the lower to mid-stratosphere altitude.

The troposphere is thickest at the equator, reaching about 17 km, and thinnest at the poles, around 7 km, due to temperature differences affecting atmospheric expansion.