Biosphere: The regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms.
Noun: All of the ecosystems in the world make up the biosphere.
Logy - Theory: a supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained.
Noun - suffix: There are a number of different theories about the cause of the disease.
Astronomy: the branch of science which deals with celestial objects, space, and the physical universe as a whole.
Noun: I've always had an interest in astronomy.
Atmos - Vapor: a substance diffused or suspended in the air, especially one normally liquid or solid.
Noun - suffix: dense clouds of smoke and toxic vapor.
Graphy - description: a descriptive science.
Noun - Prefix: The statistics can be depicted as a graph.
Clima - region: An area or division, especially part of a country or the world having definable characteristics but not always fixed boundaries.
Noun - prefix: One of the region's major employers.
Physical geography: The branch of geography dealing with natural features and processes.
Noun: Her fascination with the surface of the earth led her to study physical geography.
Atmosphere: The envelope of gases surrounding the earth or another planet.
Noun: Part of the sun's energy is absorbed by the earth's atmosphere.
Meteorology: the branch of science concerned with the processes and phenomena of the atmosphere, especially as a means of forecasting the weather.
Noun: an induction course to learn basic meteorology.
Oceanography: the branch of science that deals with the physical and biological properties and phenomena of the sea.
Noun: The group's work in polar oceanography continued at a modest level.
Geology: Geology is the primary Earth science and looks at how the earth formed, its structure and composition, and the types of processes acting on it.
Noun: There are museums of mineralogy and geology, a lower school of mining, model room and scientific library.
Geo - earth: The planet on which we live; the world.
Noun - Prefix: The diversity of life on earth
Hydrology: the branch of science concerned with the properties of the earth's water, and especially its movement in relation to land.
Noun: Water tracing is a technique used to investigate underground hydrology, and can provide this crucial missing information.
Hydro - water: a hydroelectric power plant.
Noun - Prefix: It took a lot of persuasion from Darren Cox to put black hydro into it!
Astro - Star: a fixed luminous point in the night sky which is a large, remote incandescent body like the sun.
Noun - prefix: The walls were painted with silver moons and stars
Hydrosphere: All the waters on the earth's surface, such as lakes and seas, and sometimes including water over the earth's surface, such as clouds.
Noun: Lakes and rivers are important sources of freshwater in the earth's hydrosphere.
Bio - life: A biography or short biographical profile of someone.
Noun - prefix: The latest in a series of unauthorized bios
Paleontology: Paleontology is the study of ancient life, from dinosaurs to prehistoric plants, mammals, fish, insects, fungi, and even microbes.
Noun: If you are on the west coast, don't miss the Ruth Hall Museum of Paleontology.
Climatology: The scientific study of climate.
Noun: The role of clouds is one of the big conundrums of climatology.
Geosphere: Any of the almost spherical concentric regions of matter that make up the earth and its atmosphere, as the lithosphere and hydrosphere.
Noun: cycle is through direct emissions from burning fossil fuels, which transfers carbon from the geosphere into the atmosphere.