SME
Grade 12 Science
Earth's history: the early Earth, its atmosphere and the history of life
The main lesson, then each kind of problem it solves.
Earth's history: the early Earth, its atmosphere and the history of life
Main lesson
Day length from fossil coral
Use this for “A fossil coral shows 1,200 daily growth lines across 3 yearly bands. How long was a day then?”
How oxygen filled the air
Use this for “How did the first photosynthesis change Earth’s air, and what did it leave in the rocks?”
Early Earth’s air and today’s
Use this for “How was Earth’s early atmosphere different from today’s, and what changed it?”
The history of life
Use this for “Put the major steps in the history of life in order, from the first cells to humans.”