What does the atmosphere do for us give three reasons?

The atmosphere blocks out harmful rays from the sun. The ozone layer, which lies in the stratosphere 11 to 50 kilometers from the Earth’s surface, blocks out many harmful forms of radiation. Without the ozone layer, ultraviolet rays would destroy most life on Earth. Gases in the atmosphere also hold in heat.

Why air pollution is an important local issue?

Air pollution is responsible for major harmful effects on human health, animal lives, natural ecosystems and the man-made environment. It is also responsible for climate change due to the enhanced greenhouse effect, acid rain, and the depletion of the ozone layer that constitute important global environmental problems.

How do humans affect atmosphere?

There is overwhelming evidence that human activities, especially burning fossil fuels, are leading to increased levels of carbon dioxide and other greenhouse gases in the atmosphere, which in turn amplify the natural greenhouse effect, causing the temperature of the Earth’s atmosphere, ocean, and land surface to …

How are living things created?

Before long Earth had oceans, which were hot and rich in carbon-based chemicals. Now two things could happen. Oparin supposed that the molecules central to life, like sugars and amino acids, could all have formed in Earth’s waters. Second, some of the chemicals began to form microscopic structures.

What gases make up the atmosphere?

The air in Earth’s atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.

What is the importance of pollution?

When we breathe polluted air pollutants get into our lungs; they can enter the bloodstream and be carried to our internal organs such as the brain. This can cause severe health problems such as asthma, cardiovascular diseases and even cancer and reduces the quality and number of years of life.

Where did the carbon in all living things come from?

So where then did all the carbon that living organisms are built of come from? It turns out that most of the carbon we use today came from a collision with another smallish planet about 4.4 billion years ago.

What are the main functions of the atmosphere?

The atmosphere of Earth protects life on Earth by creating pressure allowing for liquid water to exist on the Earth’s surface, absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night (the diurnal temperature variation …

Why is the atmosphere important to us?

The atmosphere protects living things from the Sun’s most harmful rays. Gases reflect or absorb the strongest rays of sunlight (figure below). The atmosphere shields Earth from the most harmful solar rays.

What are 20 uses of air?

Important Uses of Air

• Sustain life and growth.
• Combustion.
• Maintaining Temperature.
• Supplier of Energy.
• Photosynthesis.

Which gas was absent primitive Earth?

oxygen

What are the two main gases found in the atmosphere?

The atmosphere is composed of a mix of several different gases in differing amounts. The permanent gases whose percentages do not change from day to day are nitrogen, oxygen and argon. Nitrogen accounts for 78% of the atmosphere, oxygen 21% and argon 0.9%.

Why is atmosphere important for us Class 7?

The atmosphere contains the air that we breathe; protects us from the harmful radiation of the Sun; helps to keep the planet’s heat on the surface, and plays a very important role in the water cycle. Plants require carbon dioxide for photosynthesis; they use sunlight to change carbon dioxide and water into food.

Which gas is least in atmosphere?

Nitrogen and oxygen are by far the most common; dry air is composed of about 78% nitrogen (N2) and about 21% oxygen (O2). Argon, carbon dioxide (CO2), and many other gases are also present in much lower amounts; each makes up less than 1% of the atmosphere’s mixture of gases. The atmosphere also includes water vapor.

Which is the most abundant gas in the atmosphere?

carbon dioxide

How long ago was the formation of the earth?

Formation. When the solar system settled into its current layout about 4.5 billion years ago, Earth formed when gravity pulled swirling gas and dust in to become the third planet from the Sun.

What are 3 facts about the atmosphere?

10 Fascinating Facts about Earth’s Atmosphere

• #1. Earth Has Had Three Atmospheres.
• #2. Oxygen Caused the First Major Extinction.
• #3. Global Warming Was Once Much Greater.
• #4. The Sky Should Be Violet.
• #5. The Atmosphere Extends 6,200 Miles into Space.
• #6. Oxygen Levels Used to Be Much Higher.
• #7. Blood Boils After 60,000 Feet.
• #8.