12 reasons not to get a PhD. (CBS Moneywatch) COMMENTARY Earning a doctorate is widely considered to be an excellent way to boost a person's lifetime earnings potential. 1. A PhD takes twice as long as a bachelor's degree to complete.
The International Space Station orbits Earth in this layer. mesopauseâthe boundary between the mesosphere and the thermosphere; the coldest place on Earth. mesosphereâthe layer in which most meteors burn up after entering Earthâs atmosphere and before reaching Earthâs surface. stratopauseâthe boundary between the mesophere and the stratosphere. stratosphereâcontains the ozone layer; the layer where volcanic gases can affect the climate. tropopauseâthe boundary between the stratosphere and troposphere. troposphereâthe layer closest to Earthâs surface in which all weather occurs.
The atmosphere is made up of several layers: the troposphere, stratosphere, mesosphere, ionosphere, and exosphere. Closest to Earth is the troposphere. Most of the clouds you see in the sky are found in the troposphere, and this is the layer of the atmosphere we associate with weather.Extending up to 10 miles above Earth's surface, the troposphere contains a variety of gases: water vapor, carbon dioxide, methane, nitrous oxide, and others.his is the outermost layer of the atmosphere, the transition zone into space. The greenhouse effect. The gases in the atmosphere that help retain heat are called greenhouse gases. These gases, primarily carbon dioxide (CO2), absorb heat instead of allowing it to escape into space.