Fossils. The earliest clues about life on earth are about 3.5 billion years old!!!!
Radiometric Dating. First Attempted in 1905 Compare U and Pb content of minerals Very crude but quickly showed ages over a billion years Skepticism about.
Warm Up/DO NOW 1. What causes geologic change (changes to the land) on earth? 2. What are the 3 types of plate boundaries? 3. Which plate boundary causes.
Radiometric Dating of Rocks 1896-1898 Radioactivity discovered by: Henri Becquerel and Marie and Pierre Curie.
Fossils and evolution Rates of deposition of sediments Cooling of the Earth from a molten state Radiometric Dating Methods for Estimating the Age of the.
21.3 – Absolute-Age Dating Objectives describe how scientists date rocks and other objects using radioactive elements Explain how scientists can use certain.
{ Chapter 14 History of Life. Biogenesis: states that all living things come from other living things. It is our current understanding of the life process.
Absolute Dating Using Radioactivity. Absolute Age dating was major advance in Historical Geology – More accurate reconstruction of geologic events Mostly.
©1998 Timothy G. Standish 1Thessalonians 5:21 Prove all things; hold fast that which is good.
GEOLOGIC TIME Earths History Compressed:. GEOLOGIC TIME I. Early Efforts of Dating the Age of the Earth.
7-2 Notes Absolute Ages of Rocks Chapter 7, Lesson 2.
Relative Age Dating Vs. Exact Age Dating How do geologists know how old something is? How old is the earth? How do geologists know how old something is?