ammonification
1
process by which certain bacteria convert organic nitrogen into ammonia and ammonium salts during decomposition
2. assimilation
4
the study of the universe beyond the earth
3. asthenosphere
3
the layer immediately surrounding the lower mantle; composed of molten rock
4. astronomy
5
the gaseous layer of a planet, usually retained by its gravity
5. atmosphere
6
the living organisms of Earth
6. biosphere
process of heat transfer by the circulation or movement of a gas, liquid, or plastic material
7. continental crust
2
process by which plants or animals convert nutrients into usable organic compounds, such as proteins
8. continental drift
area where tectonic plates meet and push against each other
9. convection
theory proposed by Alfred Wegener that the continents once formed a single supercontinent that broke up and drifted apart
10. convergent boundary
the part of Earth's crust that forms landmasses