Test: The Interior of the Earth - Class 7 MCQ

The outermost layer of the Earth is called the crust. It's like the Earth's skin! Just like how we have skin to protect our bodies, the crust protects the Earth. The crust is where we live, and it's where all the land and oceans are.

The crust is the outermost layer of the Earth, which means it is the layer on the outside or surface of the Earth.

• The Earth's core is mainly made up of nickel and iron. These elements are like the core's building blocks, helping to create a strong and solid center for our planet.
• It's like how bricks are used to build a house, but in this case, nickel and iron are the special materials that make up the core of the Earth.

The mantle lies beneath the Earth's crust, which is like the Earth's outer skin. It is about 2,900 km thick. So, the correct answer is "Crust," which is the outermost layer of the Earth.

• Igneous rocks form by cooling and solidifying magma. Imagine magma as very hot melted rock deep underground. When this magma cools down, it becomes solid and turns into igneous rocks. It's like when you leave hot soup to cool down, and it becomes solid jelly! So, igneous rocks are like the jelly that forms when hot magma cools and hardens.

Lava moves upward towards the Earth's crust, cools, and solidifies to form igneous rocks. Lava is very hot liquid rock that comes out during volcanic eruptions.

• Sedimentary rocks form when small pieces of rocks and minerals are compressed and hardened over a long time. This process creates layers in the rocks.
• Imagine stacking your toys on top of each other and pressing them down to make a big toy tower. That's how sedimentary rocks form, by pressing down layers of sediments to make strong rocks.

Sedimentary rocks are generally more porous and softer than igneous rocks. This means that they are usually easier to break and not as hard as rocks that come from volcanic activity.

• Minerals are divided into two main types: Metallic and Non-Metallic.
• Metallic minerals are usually found in igneous rocks like iron ore and copper.
• Non-Metallic minerals, on the other hand, are primarily found in sedimentary rocks like limestone and mica.
• Remember, metallic minerals are like iron and copper, while non-metallic minerals are like limestone and mica.

Rocks start forming with magma deep inside the Earth. Magma is very hot melted rock that cools down to become different types of rocks.

Rocks are used as building blocks in construction to make houses, buildings, and roads. They are strong and help in making structures sturdy. Just like how you use blocks to build a tower, rocks are used to build big things like houses and bridges.

Fossil fuels like coal, oil, and gas are used for cooking food, such as boiling water, and heating homes. They help in making delicious meals and keeping us warm.

The Earth is like a big round stone with different layers inside it. Just like when you see the layers of an onion when you cut it, the Earth has layers one inside the other. Imagine the Earth as a huge round rock with many layers, like the layers of an onion, but much bigger!

• Just like the crust of bread, it is the outer layer of the Earth's surface.
• The crust is where we live and where we find land, like continents and islands.
• It's like the Earth's skin that covers everything underneath it, including rocks, soil, and oceans.

The crust is like the Earth's skin. It covers the whole planet. It's the part we walk on and where the land and oceans are. So, the crust forms the Earth's surface.

• The mantle is mainly made up of silica and magnesium.
• Silica is like tiny grains of sand, and magnesium is a shiny metal.
• Together, they form a part of the Earth's layers that is very important for how our planet works.
• Imagine the mantle like a warm, gooey layer beneath the Earth's surface that helps create the movements we sometimes feel as earthquakes and volcanoes!

The mantle is thinner and denser than the continental crust and is composed mainly of silica and magnesium. This makes it different from the continental crust in terms of its composition and density. Magnesium is a special element that makes the mantle unique.

• Rocks are grouped into three main types: Igneous, Sedimentary, and Metamorphic.
• Igneous rocks form when magma cools and solidifies.
• Sedimentary rocks are made from compressed sediments.
• Metamorphic rocks change due to heat and pressure.
• So, rocks can be put into these three categories based on how they are formed.

Rocks come in different colors, sizes, and textures. This means that rocks can look different from one another. Some rocks can be red, some can be blue, and some can be green. So, rocks vary in colors.

When lava cools and hardens on the Earth's surface, it forms extrusive rocks. These rocks are made of very fine grains and sometimes look glassy because the lava cools quickly. So, when you see rocks like this, you can remember they are extrusive rocks!

Rocks are made of different naturally occurring substances called minerals. These minerals have their own special chemical makeup and specific physical traits. Imagine rocks like a big puzzle made up of tiny building blocks called minerals that fit together to form the rock you see.

Explanation: Rocks are made up of different things called minerals. These minerals have their own special ingredients and looks. So, the statement is True.

Igneous rocks are typically rich in metallic minerals. These minerals include substances like iron ore, copper, and bauxite. Metallic minerals are important for making various useful things like iron for construction and copper for electrical wiring.

Metallic minerals are usually found in igneous rocks. These rocks are formed when magma cools down and hardens. This process happens deep inside the Earth and leads to the creation of rocks like granite and basalt.

• Explanation: Metallic minerals are generally found in igneous rocks, not in sedimentary rocks. Sedimentary rocks are where non-metallic minerals are primarily found, such as limestone, mica, and kaolinite. So, the statement is False.
• Additional Fun Fact: Did you know that metallic minerals like iron ore, copper, and bauxite are often found in rocks formed from molten magma deep inside the Earth?

• Rocks are primarily used for building blocks in construction. They help in making strong and sturdy buildings.
• Just like how you use toy blocks to build a house, real rocks are used to make big buildings and roads too.
• So, rocks are like the strong blocks that hold up our buildings and structures.

Fossil fuels are not used for making toys. They are very important sources of energy that help us do things like cooking food, driving cars, and making electricity. So, the statement is False. Fossil fuels are used for important things, not for making toys.