The atmosphere By: Anne Karen C. Bautista and Michaella S. Mamansal

The atmosphere is a mixture of gases that surrounds the Earth. It helps make life possible by providing us with air to breathe, shielding us from harmful ultraviolet (UV) radiation coming from the Sun, trapping heat to warm the planet, and preventing extreme temperature differences between day and night. The atmosphere surrounds the Earth and holds the air we breathe; it protects us from outer space; and holds moisture (clouds), gases, and tiny particles. In short, the atmosphere is the protective bubble in which we live. An atmosphere is made of the layers of gases surrounding a planet or other celestial body. Earth's atmosphere is composed of about 78% nitrogen, 21% oxygen, and one percent other gases. The atmosphere is a layer of gas and suspended solids extending from the Earth's surface up many thousands of miles, becoming increasingly thinner with distance but always held by the Earth's gravitational pull. The atmosphere is layered is the most accurate statement, and it is layered based on composition as well as thermal profile. The atmosphere doesn't just surround most of the Earth, but all of it, and is important to all life. The atmosphere is a mixture of gases that surrounds the Earth. It helps make life possible by providing us with air to breathe, shielding us from harmful ultraviolet (UV) radiation coming from the Sun, trapping heat to warm the planet, and preventing extreme temperature differences between day and night. Without the atmosphere, temperatures would be well below freezing everywhere on Earth's surface. Instead, the heat absorbed and trapped by our atmosphere keeps our planet's average surface temperature at a balmy 15°C (59°F). Some of the atmosphere's gases, like carbon dioxide, are particularly good at absorbing and trapping radiation. Changes in the amounts of these gases directly affect our climate. itrogen and oxygen are by far the most common gases in our atmosphere. Dry air is composed of about 78% nitrogen (N2) and about 21% oxygen (O2). The remaining less than 1% of the atmosphere is a mixture of gases, including argon (Ar) and carbon dioxide (CO2). The atmosphere also contains varying amounts of water vapor, on average about 1%. There are also many, tiny, solid or liquid particles, called aerosols, in the atmosphere. Aerosols can be made of dust, spores and pollen, salt from sea spray, volcanic ash, smoke, and pollutants introduced through human activity. There are several unique layers in Earth's atmosphere. Each has characteristic temperatures, pressures, and phenomena. We live in the troposphere, the layer closest to Earth's surface, where most clouds are found and almost all weather occurs. Some jet aircraft fly in the next layer, the stratosphere, which contains the jet streams and a region called the ozone layer. The next layer, the mesosphere, is the coldest because the there are almost no air molecules there to absorb heat energy. There are so few molecules for light to refract off of that the sky also

2. ATMOSPHERE
The atmosphere is a mixture of gases that
surrounds the Earth. It helps make life possible by
providing us with air to breathe, shielding us from
harmful ultraviolet (UV) radiation coming from the
Sun, trapping heat to warm the planet, and
preventing extreme temperature differences
between day and night. Some of the atmosphere's
gases, like carbon dioxide, are particularlygood at
absorbing and trapping radiation.

3. TROPOSPHERE

4. TROPOSPHERE

7. MESOSPHERE
The mesosphere isthe third and coldest
layer of Earth's atmosphere, reaching about
130 degrees below zero. The mesosphere is
also where most meteors, or space rocks
and metal, burn up before they can crash to
the ground. It's like a superhero's force field
that protects the Earth!

8. THERMOSPHERE

9. THERMOSPHERE
The thermosphere isthe atmospheric
region from ∼85 to ∼500 km altitude,
containing theionosphere. It is
characterized by high temperature and
large variability, in response to
changes in solar ultraviolet radiation
and solar-driven geomagnetic activity.

10. EXOSPHERE
Exosphere. This isthe outermost layer of
the atmosphere. It extends from about
375 miles (600 km) to 6,200 miles
(10,000 km ) above the earth. In this
layer, atoms and molecules escape into
space and satellites orbit the earth.

11. MEMBERS:
ANNE KAREN C. BAUTISTA
MICHAELLA S. MAMANSAL