21.3 – Absolute-Age Dating Objectives describe how scientists date rocks and other objects using radioactive elements Explain how scientists can use certain.
Chapter 13
Absolute Ages of Rock Mr. Perez. Important vocabulary Isotopes Radioactive decay Half-life Radiometric dating Uniformitarianism.
Fossils Remains of organisms (often partially or wholly replaced by “rock”) Bones, teeth, shells, hard exoskeletons Usually in sedimentary rocks (water.
Chapter 4 Opener Skeletal remains of the Pliocene hominin Australopithecus afarensis Evolution and the fossil record Today: phyletic evolution or anagenesis.
Geology: The Study of the Earth Physical geology Study of the materials and processes of the Earth. Historical geology Study of the origin and evolution.
Absolute Age of Rocks
Geologic Time By examining layers of sedimentary rock, geologists developed a time scale for dividing up earth history. Earlier in the 20 th century, radiometric-dating.
Absolute Time Mrs. Wright 8 th Grade Science Bath County Middle School.
Absolute Ages of Rock
21.3 – Absolute-Age Dating
Geologic Time
