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Earth science
Any of several geological sciences that are concerned with the earth, its origins, and all of its various structures and physical forms and phenomena.
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Earth science > Geology 
Hubble Space Telescope (HST)
Earth science; Geology
A 98 inch, Earth orbiting reflecting space telescope which is equipped with infrared, x-ray and other electromagnetic sensors. Named after famous American astronomer, Edwin ...
hummocky
Earth science; Geology
Uneven; describing a terrain abounding in irregular knolls, mounds, or other small elevations.
hydrologic system
Earth science; Geology
Water cycling during past wet episodes on Mars would have had many components. A thick atmosphere most likely carried a substantial amount of water evaporated from lakes and seas. ...
hydrosphere
Earth science; Geology
The waters of the Earth, including surface and subsurface water. All the oceans, snow, ice and glaciers.
hypersthene
Earth science; Geology
A common rock forming mineral of the orthopyroxene group, (Mg,Fe)SiO 3 . It is isomorphous with enstatite. It is an essential constituent of many igneous rocks.
ice age
Earth science; Geology
A loosely used synonym for glacial epoch, or time of extensive glacial activity.
ice shelves
Earth science; Geology
A sheet of very thick ice with a level or gently undulating surface, which is attached to the land along one side but most of which is afloat and bounded on the seaward side by a ...
Sub-categories
- Geology (10953)
- Mapping science (105290)
- Oceanography (12332)
- Physical oceanography (42660)
- Remote sensing (8661)
- Seismology (14406)
- Soil science (29216)