GEOGRAPHY

They are, from deepest to shallowest, the inner core, the outer core, the mantle and the crust. Except for the crust, no one has ever explored these layers in person.

The thickness of the atmosphere, depending upon the definition, is between 100 and 10,000 kilometers. Troposphere Layer. The troposphere can be found between the ground and an altitude of 7 to 20 kilometers (4 to 12 miles). … The Stratosphere. … The Mysterious Mesosphere. … The Thermosphere and Outer Space.

As Earth cooled, an atmosphere formed mainly from gases spewed from volcanoes. It included hydrogen sulfide, methane, and ten to 200 times as much carbon dioxide as today’s atmosphere. After about half a billion years, Earth’s surface cooled and solidified enough for water to collect on it.

Atmosphere is essential for life on Earth as it supplies oxygen, water, CO2 and some nutrients (N) to living organisms, and protects living organisms from temperature extremes and excessive UV radiation.

What and where are the ionosphere and exosphere? Ionosphere: is the lower layer of the thermosphere.This is where earth’s communication is located along with the aurora borealis.Exosphere: is the upper layer of the thermosphere.

Scientists believe that the inner core is the hottest layer of the Earth, that it is composed mostly of iron and nickel, and that although it is hot enough to be a liquid, it acts as a solid because of the immense amount of pressure on it.

Earth’s atmosphere is composed of about 78% nitrogen, 21% oxygen, and one percent other gases. These gases are found in layers (troposphere, stratosphere, mesosphere, thermosphere, and exosphere) defined by unique features such as temperature and pressure.

The most abundant naturally occurring gas is Nitrogen (N2), which makes up about 78% of air. Oxygen (O2) is the second most abundant gas at about 21%. The inert gas Argon (Ar) is the third most abundant gas at .

Layers of the atmosphere: troposphere, stratosphere, mesosphere and thermosphere.

An atmosphere contains the air that we breathe and is a blanket of gases that surrounds Earth. It is held near the surface of the planet by Earth’s gravitational attraction. A barometer is used to measure air pressure. Argon, oxygen and nitrogen from the three main constitutions of the atmosphere.