The three types of rocks are igneous, formed from molten rock, sedimentary, formed from the elements of an existing rock, and metamorphic, formed by a change in heat or pressure.Learn to identify the three different types of rocks in this lesson on rocks. These rocks are those which were formed deep in the earth's crust by melting and then recrystallization.

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See also the Rice University Department of Physics and Astronomy Colloquia and the Department of Earth Science Colloquia pages for other space science talks in the Houston area.

Wiens has a Ph D in Physics, with a minor in Geology.

His Ph D thesis was on isotope ratios in meteorites, including surface exposure dating.

He was employed at Caltech's Division of Geological & Planetary Sciences at the time of writing the first edition.

He is presently employed in the Space & Atmospheric Sciences Group at the Los Alamos National Laboratory.Radiometric dating--the process of determining the age of rocks from the decay of their radioactive elements--has been in widespread use for over half a century.Rocks are naturally occurring solid material consisting of various minerals. Rocks are classified by mineral composition, how they were formed and other physical attributes such as texture. Sedimentary rocks are formed by deposition and hardening of clastic sediments, minerals precipitates and organic matter.Metamorphic rock forms when pre-existing rock undergoes changes due to high temperatures and pressures.Find out how moon rocks brought to Earth by the Apollo astronauts have helped NASA learn more about the rock cycle.Compare igneous, sedimentary and metamorphic rocks found on Earth to three types of rocks found on the moon.