1. Introduction to Earth Sciences1
Warm Up 1/10/08 1. 1. Fossils are the ____. a. oldest layers of rock in a region b. objects that people of long ago left behind as artifacts c. living.
Warm Up 1) 1) Atoms with the same atomic number but different mass numbers are called ____. a.ionsc. neutrons b.protonsd. isotopes 2) 2) Radiocarbon dating.
