Watch Our Water
You use this many gallons in a day
80
A process by which some organisms convert sunlight to chemical energy
photosynthesis
A major division of time, usually divided into "periods."
Era
The rule that says, "old rocks on the bottom, new rocks on top."
Law of Superposition
The period in which most animal groups suddenly appeared in the fossil record
Cambrian Explosion
This is the largest user of electricity in Arizona
the Central Arizona Project (CAP)
A gas that retains heat in the Earth's atmosphere
Greenhouse
The largest division of geologic time
Eon
When you get the specific age of an object in years
Absolute Dating
"Middle Life," with dinosaurs and such
Mesozoic
The weight of a gallon of water
8 pounds
This gas keeps the atmosphere warm, is produced by animal respiration and burning things.
Carbon Dioxide (CO2)
The chunk of time in whic specific rock systems were formed
Period
When you can determine that an object is younger or older than another object
Relative Dating
The longest span of Earth history, during which there was little or no multicellular life
Precambrian
This is where our groundwater hangs out
the aquifer
The element that almost killed everything 2.4 Billion years ago
Oxygen
What we call the whole history of the Earth, from ball of lava to now.
The Geological Time Scale
Layer in which you find a fossil of evidence of an event
Strata
Current Life, where we are now
Cenozoic
Reuired to get groundwater to the surface
pumps
When each of your molecules get slowly replaced by rock molecules
petrification
The smallest subdivision of a period
Epoch
A fossil of an organism that was everywhere but only for a little while, so it identifies a certain time strata
Index Fossil
Our earliest ancestors, who almost farted the whole planet to death.
Cyanobacteria