Explanation

The composition of dry air is:

1. Nitrogen (N2) - approximately 78.08% by volume
2. Oxygen (O2) - approximately 20.95% (21%) by volume
3. Argon (Ar) - approximately 0.93% by volume
4. Carbon Dioxide (CO2) - approximately 0.04% by volume (varies with location and time)

Explanation

• Deforestation is the permanent destruction of forests to make the land available for other uses.
• Such as agriculture, urbanization, and logging.

Explanation

Carbon monoxide (CO) is a colorless, odorless, and highly toxic gas that is emitted by the incomplete combustion of fossil fuels, such as gasoline, natural gas, and wood.

Explanation

• Global warming is the gradual increase in Earth's surface temperature, primarily caused by human activities releasing greenhouse gases. 
• It leads to rising temperatures, extreme weather events, and altered ecosystems.

Explanation

• Air pollution is actually considered the most dangerous type of pollution.
• According to the World Health Organization (WHO), air pollution is responsible for an estimated 7 million premature deaths worldwide each year, mainly due to heart disease, stroke, and lung cancer.

Explanation

Nitrogen (N2) is the most abundant gas in the Earth's atmosphere

They make up about 78% of the atmosphere's composition.

Oxygen (O2) is the second most abundant gas

Explanation

• A food web is a network of multiple food chains that overlap and connect.
• It showing the complex feeding relationships between different species in an ecosystem.
• It's a web-like structure that illustrates the various pathways that energy and nutrients flow through the ecosystem.

Explanation

The food chain is the sequence of energy transfer from:

• Producers (plants, algae, phytoplankton) →
• Consumers (herbivores, carnivores, omnivores) →
• Decomposers (fungi, bacteria, insects)

This energy transfer is also known as the energy flow or trophic cascade.

Explanation

• Deserts are areas with very low rainfall, typically less than 25 centimeters (10 inches) per year.
• It resulting in a barren and often sandy landscape with limited vegetation and wildlife.

Explanation

• Grasslands, also known as prairies or savannas, are areas with lower rainfall than forests, typically between 50-200 mm annually.
• This lower rainfall doesn't support the growth of trees, but instead favors grasses and other herbaceous plants.