Magma
Understanding Earth's Molten Material
The Earth is made up of different layers. Think of it like an onion! The outer layer is the crust, where we live. Beneath the crust is the mantle, which is a thick layer. Below the mantle is the core, which is at the very center.
The question asks about the molten material found specifically in the mantle, mixed with gases. Molten means it is melted and in a liquid or semi-liquid state because it is very hot.
Identifying Molten Rock Below the Surface
Deep inside the Earth, including in the mantle, there is extremely hot rock that can melt. This melted rock, when it is still inside the Earth, is given a specific name. It often contains dissolved gases.
Analyzing the Options
Let's look at the options provided:
- Magma: This term refers to molten or semi-molten natural material generated in the interior of celestial bodies such as the Earth. When it is found beneath the surface of the Earth, it is called magma. It is typically a complex mixture of molten rock, dissolved gases, and solid crystals.
- Helium: Helium is a chemical element, a light gas. It is not molten rock material found in the Earth's mantle.
- Core: The core is the innermost layer of the Earth. While parts of the core are molten, the question asks about the molten material *in the mantle*, not the layer itself.
- Lava: Lava is molten rock that has been expelled from the interior of a terrestrial planet (or a moon) onto its surface. It is essentially what magma becomes when it erupts onto the surface.
Conclusion on Molten Mantle Material
Based on the definitions, the molten material mixed with gases found within the Earth's mantle (below the surface) is correctly identified as magma.
Therefore, the correct answer is Magma.
Revision Table: Key Terms
| Term | Definition | Location |
|---|---|---|
| Magma | Molten or semi-molten rock material, often with gases and crystals | Inside the Earth (e.g., mantle, crust) |
| Lava | Molten rock material erupted onto the Earth's surface | On the Earth's surface |
| Mantle | The layer of the Earth between the crust and the core | Below the crust, above the core |
| Core | The innermost layer of the Earth | Center of the Earth |
Additional Information on Earth's Structure and Magma
The Earth's mantle is not entirely liquid; it is mostly solid rock that behaves like a very viscous fluid over long geological timescales. However, in certain areas, due to specific conditions like pressure changes or the presence of water, rocks can melt to form magma.
Magma collects in underground reservoirs called magma chambers. When the pressure in a magma chamber becomes high enough, or if a pathway to the surface opens up (like a volcanic vent), the magma can rise towards the surface. If it reaches the surface and erupts, it becomes lava.
The composition of magma varies depending on where and how it forms, which affects its properties like viscosity and the type of volcanic eruption it might produce.
Important Questions from Chemistry
Common salt (NaCl) is not used as a raw material for preparation of which one of the following compounds?
Which one of the following is the chemical formula of Hypobromous acid?
Which one of the following is not used as a raw material in the manufacture of glass?
Which one of the following statements about dihydrogen (H 2) is not correct?
Reaction of quick lime (CaO) with water to produce slaked lime (Ca(OH) 2) is an example of
