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1.
Acid rain
Subjects
Rain and rainfall
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2.
Acis soils
Subjects
Soils
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3.
Acritarchs
Subjects
FossilsMicroorganisms
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4.
Age of the Earth
Subjects
-
5.
Agricultural meteorology
Subjects
Meteorology
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6.
Alabaster
Subjects
-
7.
Alexandrite
Subjects
-
8.
Alkalic igneous rocks
Subjects
Igneous rocks
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9.
Alluvial fans
Subjects
-
10.
Alluvial streams
Subjects
Rivers
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11.
Alluvium
Subjects
Sediments (Geology)
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12.
Altitudes
Subjects
Geospatial dataPhysical geography
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13.
Amber
Subjects
Precious stones
-
14.
Ammonoidea
Subjects
Fossil cephalopoda, Fossil
-
15.
Amphiboles
Subjects
Silicates
-
16.
Analytical geochemistry
Subjects
GeochemistryAnalytical chemistry
-
17.
Andesite
Subjects
Igneous rocks
-
18.
Anemomèter
Subjects
Meteorological instruments
-
19.
Animal tracks
Subjects
-
20.
Anthropocene
Subjects
Quaternary
-
21.
Aplite
Subjects
Igneous rocks
-
22.
Aproz (Trademark)
Subjects
Trademarks
-
23.
Aptian
Subjects
Cretaceous Period
-
24.
Aquifers
Subjects
Hydrogeology
Last updated dated: 14/07/2025