Explanation

• The scientist who first discovered that the earth revolves around the sun was Copernicus.
• Earth's Rotational Theory:
  • Rotation can be defined as the spin of Earth on its own axis from west to east direction.
  • It must also be noted that the speed of rotation of the earth is not constant throughout latitudes.
    
  • It differs at different latitudes.

Explanation

Geothermal, Solar, and Hydropower all come from naturally replenished sources.

These energies are renewable because they do not deplete with use and are environmentally friendly.

Renewable sources of energy include:

• Solar energy
• Wind energy
• Hydropower
• Geothermal energy
• Biomass

Explanation

• The most abundant component in Earth's atmosphere is nitrogen, making up about 78% of the air.
• The second most abundant gas is oxygen, which makes up about 21% of the air.
• Hydrogen and carbon dioxide are both present in the air, but in much smaller amounts than nitrogen and oxygen.

Explanation

Explanation

Cooking is difficult in the mountains primarily due to low atmospheric pressure, which affects the boiling point of water. 

Decreased Pressure at High Altitude:

As altitude increases, the atmospheric pressure decreases because there is less air pushing down from above.

Lower Boiling Point:

Water boils when its vapor pressure equals the surrounding atmospheric pressure.

With lower pressure on mountains, water needs less heat to reach its boiling point, so it boils at a lower temperature than the 100°C (212°F) it does at sea level.

Slower Cooking:

Since food cooks based on temperature, boiling it in water that is not as hot (e.g., 92°C at 8,000 feet) means the cooking process takes significantly longer to achieve the same result as at sea level. 

Explanation

The stratospheric ozone layer is Earth's “sunscreen”  protecting living things from too much ultraviolet radiation from the sun.

Oxygen layer in the atmosphere

Ozone protects us from the harmful ultraviolet radiation of the sun.

Ozone formula: O3

The ozone layer lies approximately 15-40 kilometers (10-25 miles) above the Earth's surface, in the stratosphere.

The ozone layer is depleting: Air pollution

Explanation

Nimbo-stratus clouds are most likely to cause heavy rainfall.

These are thick, dark, and low-lying clouds that often cover the sky. 

They are associated with continuous, steady precipitation.

Explanation

The age of a tree is determined by counting its growth rings.

They are visible in the cross-section of the stem.

Each ring represents one year of growth.

Explanation

The ozone layer lies about 12 to 50 km above Earth’s surface, mainly in the stratosphere.

It protects life by absorbing the Sun’s harmful ultraviolet (UV) rays.

Explanation

Acid rain is mainly caused by emissions of Sulfur dioxide and Nitrogen oxide in the atmosphere.

Acid rain mainly Causes health problem like Asthma.