Soil is found in the hydrosphere.
False
The outer core of Earth is made up of a nickel-zinc alloy.
False
Lithosphere is the base on which we stand.
True
Earth Alive Class 5 Chapter 4 Earth Environment Extra QA
Q: What are the four realms of the Earth?
A: The four realms of the Earth are the hydrosphere (realm of water), atmosphere (realm of air), lithosphere (realm of land), and biosphere (realm of living things).
Q: What is the importance of the hydrosphere?
A: The hydrosphere is essential for various reasons:
- It provides drinking water through underground sources.
- Supports marine life with dissolved oxygen.
- Contributes to the water cycle, including rainfall.
- Supplies salt and food sources from oceans and seas.
Q: Describe the water cycle.
A: The water cycle involves several processes:
- Sun heats water, causing it to evaporate.
- Water vapor rises and condenses into clouds.
- Precipitation occurs when clouds become heavy.
- Some water returns to water bodies, while some is absorbed underground.
- This cycle repeats continuously.
Q: What is the importance of the atmosphere?
A: The atmosphere is important because:
- It contains oxygen vital for life.
- Regulates temperature by trapping heat.
- Shields the Earth from harmful solar radiation.
- Allows for the transmission of sound waves.
Q: What is the lithosphere, and why is it important?
A: The lithosphere is the Earth’s solid outer layer, consisting of rocks and soil. Its importance lies in:
- Providing a foundation for structures and supporting human activities.
- Supplying soil for agriculture and natural resources like minerals.
- Serving as a habitat for various forms of life.
Q: What are the main components of the hydrosphere?
A: The hydrosphere comprises oceans, seas, bays, rivers, lakes, ponds, underground water, glaciers, and streams.
Q: How does the water cycle contribute to Earth’s ecosystems?
A: The water cycle plays a crucial role in Earth’s ecosystems by ensuring the availability of water for various life forms. It facilitates the distribution of freshwater through precipitation, replenishing water sources essential for plants, animals, and humans.
Q: What are the layers of the atmosphere, and what are their functions?
A: The atmosphere consists of several layers: troposphere, stratosphere, mesosphere, thermosphere, and exosphere. Each layer serves different functions, such as trapping heat (troposphere), containing the ozone layer (stratosphere), and absorbing harmful radiation (thermosphere).
Q: Describe the structure of the lithosphere.
A: The lithosphere is the Earth’s solid outer layer, consisting of the crust and upper part of the mantle. Beneath it lie the semi-liquid mantle and the solid inner and outer core. This layer is vital for supporting terrestrial life, providing a foundation for structures, and containing valuable natural resources.
Q: How does the biosphere support life on Earth?
A: The biosphere encompasses all areas where life exists, including the atmosphere, hydrosphere, and lithosphere. It provides essential elements for life, supports diverse ecosystems crucial for maintaining ecological balance, and facilitates the evolution and adaptation of different life forms.
