[amp_mcq option1=”Ionosphere” option2=”Stratosphere” option3=”Mesosphere” option4=”Exosphere” correct=”option1″]
The correct answer is A. Ionosphere.
The ionosphere is a region of Earth’s upper atmosphere that contains high concentrations of ions and free electrons. It is located above the stratosphere and below the thermosphere. The ionosphere is important because it reflects radio waves back to Earth’s surface, allowing long-distance radio communication.
The stratosphere is the second layer of Earth’s atmosphere, above the troposphere and below the mesosphere. It is located from approximately 10 to 50 kilometers (6 to 31 miles) above Earth’s surface. The stratosphere is characterized by an increase in temperature with altitude, due to the absorption of ultraviolet radiation by ozone.
The mesosphere is the third layer of Earth’s atmosphere, above the stratosphere and below the thermosphere. It is located from approximately 50 to 80 kilometers (31 to 50 miles) above Earth’s surface. The mesosphere is characterized by a decrease in temperature with altitude, due to the lack of ozone and the presence of other gases that absorb infrared radiation.
The exosphere is the outermost layer of Earth’s atmosphere, extending from the top of the thermosphere to the beginning of interplanetary space. It is characterized by a very low density of gas molecules, which are constantly escaping into space.