Earth's Interior: Crust, Mantle, and Core

The Earth's outermost layer, consisting of continental masses and oceanic floors, is called the ______.

The continental mass's main mineral constituents are silica and alumina, hence it is called ______ (si-silica and al-alumina).

Beneath the crust lies the ______, which extends to a depth of 2900 km, playing a significant role in Earth's dynamics.

The innermost layer of the Earth, mainly made up of nickel and iron is called ______.

Igneous, sedimentary, and ______ are the three major types of rocks that constitute the Earth's crust.

Rocks formed from the cooling and solidification of molten magma or lava within or on the Earth's crust are called ______ rocks.

Rocks with a very fine-grained structure, like basalt, are formed from lava that cools rapidly on the Earth's surface and are known as ______ igneous rocks.

Rocks that form from magma cooling down deep inside the Earth's crust, characterized by their large grains, are called ______ igneous rocks.

Particles formed when rocks roll down, crack, and hit each other, transported and deposited to form layers of rocks, are called ______.

Rocks such as sandstone, made from grains of sand, which may also contain fossils of plants, animals, and other microorganisms, are called ______ rocks.

Igneous and sedimentary rocks can undergo transformation under great heat and pressure to form ______ rocks.

The process of transformation of the rock from one type to another under certain conditions in a cyclic manner is known as the ______.

The molten ______ again can cool down and solidify into igneous rocks, completing a full cycle of rock transformation.

[Blank] are naturally occurring substances with definite chemical composition and physical properties, integral to rock formation.

Naturally occurring rocks are made up of different ______.

The oceanic crust mainly consists of silica and magnesium and is therefore called ______ (si-silica and ma-magnesium).

The deepest mine in the world is in ______.

The crust forms only ______ per cent of the volume of the earth.

[Blank] per cent consists of the mantle and 15 per cent makes the core.

To reach to the centre of the earth you will have to dig a hole ______ km. deep on the ocean floor.

Naturally occurring ______ are very important to humankind and are used as fuels for example, coal, natural gas and petroleum.

To search for oil engineers have dug a hole about ______ km deep.

When the molten ______ cools, it becomes solid.

The radius of the earth is ______ km.

Latin word Ignis meaning fire is ______.

Latin word sedimentum meaning settle down is ______.

Greek word metamorphose meaning change of form is ______.

The remains of the dead plants and animals trapped in the layers of rocks are called ______.

Sedimentary rocks often contain ______ of plants and animals.

Igneous rocks are also called ______ rocks.

Rocks used to prepare paste or powder of spices and grains are made of ______.

Minerals are also used in industries such as iron, aluminum, gold, uranium, medicine, and ______.

Hard rocks are often used for constructing ______, houses, and buildings.

Rocks that are broken down into small fragments and transported by various agents are called ______.

Continental crust is characterized by silicon and ______.

The rock cycle transforms one type of rock into another in a ______ manner.

Molten magma cools to create ______ rocks.

Metamorphic rocks form under high ______ and pressure.

Sedimentary rocks are formed from compressed ______ layers.

The Earth is constantly undergoing changes ______ and outside.

Igneous and sedimentary rocks can change into ______ rocks under great heat and pressure.