Rocks and Earth Materials

Dolerite (also called diabase) is a hypabyssal igneous rock that forms at shallow depths beneath the surface. It has an intermediate grain size between volcanic rocks (fine-grained) and plutonic rocks (coarse-grained). Dolerite is often found in dikes and sills. Granite is plutonic, geysers are water features, stalactites are cave formations, and hurricanes are weather phenomena.

When limestone undergoes metamorphism, it recrystallizes to form marble. The heat and pressure cause the calcite crystals in limestone to grow larger and interlock, creating the characteristic crystalline texture of marble. Dhrain appears to be a typo, graben is a fault block, bajada is an alluvial slope, and bhabar is a piedmont plain.

A bajada is an extensive aggradational piedmont alluvial plain found in desert regions at the base of mountains. It forms through the coalescence of multiple alluvial fans created by streams emerging from mountain canyons, creating a continuous gently sloping surface. Unlike isolated alluvial fans, bajadas cover broad areas and are characteristic of arid landscapes.

Basalt is the predominant rock type found on the ocean floor, formed from volcanic eruptions at mid-ocean ridges. It is a fine-grained igneous rock that makes up the majority of the Earth's oceanic crust. While basalt is itself an igneous rock, option A is too general - the question specifically asks for the main rock type of the sea bottom.

Granite is a coarse-grained igneous rock formed from the slow cooling of magma deep beneath the Earth's surface. It is the most common intrusive igneous rock found in continental crust. Granite is composed mainly of quartz and feldspar with minor amounts of mica and other minerals.

Coal is classified as an organic sedimentary rock formed from the remains of ancient plants that were buried and compressed over millions of years. Unlike igneous rocks (formed from cooling magma) or metamorphic rocks, coal contains organic carbon and originates from biological sources. It is the only organic rock among the options.

Inselbergs are isolated rock hills or mountains that rise abruptly from a flat, surrounding plain. They are typically formed in hot, dry regions through differential weathering - where harder rock resists erosion while softer surrounding material wears away. The term comes from German meaning 'island mountain'. Examples include Uluru in Australia and Sugarloaf Mountain in Brazil.

The Maharashtra plateau is primarily composed of basalt rock, part of the vast Deccan Traps volcanic province formed about 66 million years ago. This extensive basaltic lava flow covers much of western and central India. The basalt gives the region its characteristic black soil (regur), which is very fertile for cotton cultivation.

Coal is a classic example of a fund resource - a non-renewable natural resource that can be used but cannot be replenished on human timescales. Igneous rocks and basalt are rock types, while inselberg is a landform, not a resource.

The hot molten or semi-molten rock material that erupts from a volcano is called lava. Once it cools and solidifies, it becomes igneous rock. 'Foal' is a young horse, 'Viva' is an exclamation, and 'larva' refers to the immature form of insects - none of which relate to volcanic material.

Coal and petroleum are fossil fuels found in sedimentary rocks. These rocks are formed by the accumulation and compression of organic matter over millions of years. The sedimentary process creates the conditions necessary for fossil fuel formation, unlike igneous or metamorphic rocks.

Hare Island, part of the Lakshadweep archipelago in the Arabian Sea, is formed from coral reefs. These coral atolls were created by polyp deposits over thousands of years in the warm tropical waters. Unlike sedimentary or metamorphic rock formations, coral islands develop through biological processes and are characteristic of the Lakshadweep group, which consists of 36 islands including 10 inhabited ones.