Vocabulary
The preserved remains or traces of an organism that lived in the past
Fossil
What is a half life?
The time it takes for half of the atoms in a radioactive isotope to decay into a stable isotope.
What is the geologic scale?
A record of geologic events and the evolution of life forms.
When an animal can go on land and water
Amphibian
What fish have whiskers
Catfish
The age of a rock compared to the other ages of rocks
relative age
What is an index fossil?
A fossil that is widely distributed and represents a type of organism that existed only briefly, used to date rock layers.
This massive block of time covers about 88% of Earth's history, spanning from 4.6 billion to 541 million years ago.
Precambrian time?
This is what happend when a lot of things went extinct
Mass extinction
Most common bait for fishing
live bait like minnows, worms, and shads,
A gap in the geologic record that shows where rock layers have been lost due to erosion
unconformity
Question: What is an intrusion?
A type of igneous rock feature formed when magma pushes into bodies of rock below the surface and hardens; it is always younger than the rock it cuts through.
This current era is known as the "Age of Mammals" and is the time period in which we currently live.
Cenozoic Era?
When did the first birds come
Mesozoic era
most expensive fish
Bluefin Tuna is the most expensive edible fish, fetching up to $3.2 million at auction.
The age of rock given as number of years since the rock was born
What is an unconformity
This happens when rock layers are lost to erosion, creating a visible gap in the geological record.
Often called the "Age of Reptiles", this era ended with a massive asteroid impact that wiped out the dinosaurs.
the Mesozoic Era?
The era of reptiles
Mesozic era
Bigfest fish ever caught
Great White Shark weighing 2,664 lbs
The geologic principle that states that in horizontal layers of sedimentary rock, each layer is older than the layer above it
law of superposition
Scientistsuse the half life ratio to calculate the age of___
Rocks
How many periods were there in the mesozic era
3
What do geologists look for
Fossils and different rock layers
most common fish caught
largemouth bass, bluegill, and crappie.