Geology MCQs

An island is a piece of land that is completely surrounded by water.

Latitudes and longitudes provide the precise, absolute location of a point on Earth.

In the case of a Representative Fraction (R.F.), the denominator of the fraction shows the number of units on the ground that correspond to one unit on the map.

For example, in a scale of 1:24,000, one unit on the map represents 24,000 units on the ground.

Transgression occurs when sea levels rise relative to the land, causing the shoreline to move inland. This process can be caused by factors such as melting glaciers, tectonic subsidence, or an increase in the volume of ocean water. It often results in the deposition of marine sediments over previously exposed land areas.

Oxbow lake is a small lake located in an abandoned meander loop of a river channel. They are U-shaped or curved bends in a river that are cut off from the main river flow, forming a lake. Every river contains twists and turns or meanders, that cut through the surrounding landscape in a unique way. Due to continuous erosion and deposition along the sides of the meanders, the end of the meander loop comes closer and closer. In due course of time, the meander loops cut off from the river forming a lake called oxbow lake.

Sandstone has high porosity and permeability, making it an excellent reservoir for oil.

A trap formed by varying permeability within the layers of rocks is a stratigraphic trap.

In this type of trap, the variation in permeability acts as a barrier to the migration of hydrocarbons, causing them to accumulate in certain areas.

All mentioned energy sources are derived from organic materials, such as fossils or plant matter.

Seismology is the study of earthquakes and seismic waves, which are vibrations that travel through the Earth's interior. By analyzing these waves, scientists can learn about the Earth's internal structure, composition, and dynamics.

Quartzite is metamorphosed from Sandstone while Shale is from Slate.

Black-colored soil, often referred to as black soil or regur soil, is characterized by its dark color due to the presence of abundant organic matter, specifically humus. Humus is a dark, organic substance formed from the decomposition of plant and animal matter, which is rich in nutrients and improves soil fertility.

The Earth's core is indeed the innermost layer of our planet. It is divided into two parts: the solid inner core and the liquid outer core.

Syn-crude refers to synthetic crude oil obtained through the processing of unconventional petroleum sources like oil shale.

Lithification is the process by which sediments are converted into solid rock. It involves compaction, where sediments are squeezed together under pressure, and cementation, where minerals precipitate from water and fill the spaces between sediment grains, binding them together.

Weathering is the breakdown of rocks at the Earth's surface, while fractional crystallization is a process that occurs during the cooling and solidification of magma, leading to the formation of igneous rocks. Mountain building is a tectonic process that involves the uplift of the Earth's crust.

Geographic coordinates are based on the Earth's geoid, which is approximated by an ellipsoid.

A sedimentary rock composed of rounded gravel is called a conglomerate.

Tectonic activities, driven by the Earth's internal heat, cause the Earth's crust to break into large plates called tectonic plates. These plates move slowly over time due to convection currents in the Earth's mantle. As these plates move, they can collide, separate, or slide past each other, causing the continents to drift apart.

During the day, the land heats up faster than the sea. This causes the air above the land to warm and rise, creating a low-pressure area. The cooler, denser air above the sea then flows in to replace the rising warm air, resulting in a sea breeze.

In geology, the maturity of a rock refers to the extent of transformation of organic matter into hydrocarbons (oil and gas) under pressure and temperature conditions. This is often described in terms of the "thermal maturity" of the source rock. It indicates whether the rock has reached the optimal state for generating hydrocarbons like oil or gas

Hydrolysis and hydration are chemical weathering processes that involve the reaction of minerals with water. Hydrolysis breaks down minerals by replacing cations with hydrogen ions from water, while hydration involves the addition of water molecules to minerals, causing them to expand and weaken.

Spheroidal weathering, thermal expansion, and frost heaving are all physical weathering processes that involve mechanical breakdown of rocks without changing their chemical composition.