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 on Earth is divided into five layers. Troposphere, stratosphere, mesosphere, thermosphere and exosphere. Troposphere is the Lowermost layer of the atmosphere and it contains half of the earth's atmosphere. It begins at the surface of the earth and extends out to about 4-12 miles.