1. Intro to Evolution
Fossils
Absolute vs. Relative Age
Half Life

2. There are four types of fossils:
mold fossils (a fossilized impression made in the substrate - a negative image of the organism)

3. There are four types of fossils:
cast fossils (formed when a mold is filled in)

4. There are four types of fossils:
trace fossils (fossilized nests, burrows, footprints, etc.)

5. There are four types of fossils:
true form fossils (fossils of the actual animal or animal part).

6. How old is it?
Absolute age: Based on radiometric dating, like carbon dating. Will have a number-based age.
Relative age: Based on where in the geologic column the fossil is found. Will be compared to other fossils/rocks/etc. in the column, “younger or older than…”

7. Half Life
The time it takes for half of the substance to become something else (decay)
If you’re mathematically minded, this equation may help: