s the creation/evolution debate continues, there has been an increasing sophistication of certain Creationist arguments and publications.
It can be an especially difficult challenge when the Creationist author has professional credentials and has published in mainstream scientific journals.
Sedimentary rocks are secondary in formation, being the product of precursor rocks (of any type).
Igneous rocks form from molten material, and are further subdivided into two main categories, the volcanic rocks which form from lava extruded at or near the surface; and plutonic rocks which form from magma, deep within the crust.
Gentry has spent most of his professional life studying the nature of very small discoloration features in mica and other minerals, and concluded that they are proof of a young Earth.
Geologists classify rocks into three main categories - sedimentary, igneous, and metamorphic - based on the way in which they form.
This is the second lesson in a three-lesson series about isotopes, radioactive decay, and the nucleus.The first lesson, Isotopes of Pennies, introduces the idea of isotopes.The final lesson, Frosty the Snowman Meets His Demise: An Analogy to Carbon Dating, is based on gathering evidence in the present and extrapolating it to the past.Later, this date was confirmed by two other dating methods (paleomagnetism and fission tracks), and was widely accepted.Then Richard Leakey found a skull (called KNM-ER 1470) the KBS tuff, a skull that looked far too modern to be 3 million years old.