Geology is the study of rocks.

Chapter List

1669 - The Geological Laws

The Laws of Geology include the law of super imposition, the principal of original horizonality, and the principle of discontinuity.

1812 - Properties of Minerals

Minerals and crystals can be characterized by Frederick Mohs and the Mohs' Hardness Scale, which gives values to silicates, carbonates, Sulfates, Oxides and Sulfides.

1830 - Geology Occurs by Natural Processes

Charles Lyell and his Principles of Geology and, James Hall and his study of crystals led to the theory of uniformitarianism.

1833 - The Three Types of Rocks - Igneous, Sedimentary and Metamorphic

Igneous, Sedimentary and Metamorphic were discussed by Charles Lyell.

1837 - A Past Ice Age is theorized

Louis Agassiz and his Ice Age ideas led to John Tyndell introducing the concepts of global warming and the greenhouse effect produced by CO2.

1907 - Radioactive Decay is Used to Date the Earth

Using a Geiger counter, Bertrand Boltwood used radioactivity and radioactive decay with their properties of half-lives, including the half life of Carbon 14 to date rocks.

1912 - Alfred Wegener Proposes Continental Drift Theory

Alfred Wegener and his Continental Drift Theory and plate tectonics explained, earthquakes, volcanoes and mountain building

1972 - Ancient Life and the Fossil Record

Using the fossil record and fossils, Darwin developed his theory of evolution of a single common ancestor, which became part of paleontology and was further developed by George Cuvier, Stephen Jay Gould, and Niles Eldredge.