| A | B |
|---|
| fotosíntesis | process by which plants use energy from sunlight to make sugar |
| vapor de agua | water in a gaseous state |
| ciclo de nitrógeno | closed cycle of nitrogen's use from removal from the air to be used by organisms, then returned to the air. |
| fijación de nitógeno | part of N cycle where N is removed from the air to combine with other elements forming N compounds |
| atmósfera | an envelope of gases surrounding La Tierra that extends about 1000 kms above the surface. |
| exosfera | outermost layer of the atmósfera |
| termosfera | layer of the atmósfera right below the exosfera |
| mesosfera | middle layer that extends from the edge of the stratosfera to about 65 kms. |
| estratosfera | layer of the atmósfera that contains la capa de ozono. |
| troposfera | life containing layer of the atmósfera that is closest (la más cercana) a la Tierra. |
| ionosfera | capa entre la mesofera y la termosfera. Where radio waves are reflected back to Earth. |
| magnetosfera | área en el termosfera donde las partículas solares (solar particles) are trapped and contain charged particles called VAN ALLEN radiation belts. |
| efecto invernadero | greenhouse effect |
