Definitions
Name the time in Earth's history: Clue: Lasted 4.6 billion to 542 million years ago
What is Precambrian?
True/False: Scientists believe humans have existed for most of Earth’s history.
False.
The largest division of geologic time are ______________.
What are eons?
The branch of geology that studies the order and position of rock layers and their relationship with Earth's geological history.
What is stratigraphy?
Principle that states the layers on top are younger than the layers below it.
What is Superposition?
Name the time in Earth's history: Clue #1: 251 million years ago Clue #2: Age of Reptiles
What is the Mesozoic era?
What is the shortest division of time in the geologic time scale?
What is an epoch?
Eons are divided into __________.
What are eras?
What does "strata" mean?
What is layers?
Name the time in Earth's history: Clue #1: 65 million years ago to today Clue #2: we are living during this era
What is the Cenozoic era?
During what era did the first land plants appear?
What is Paleozoic?
Eras are divided into __________.
What are periods?
Type of rock that has been formed by compacting & cementing sediment together.
What is sedimentary rock?
The oldest sections of rock are shown on the __________, and the recent sections would be on the ________.
What is bottom/top?
Name the time in Earth's history: Clue #1: Humans first appeared
What is the age of mammals or Cenozoic?
During what era were there abundant sharks?
What is the Paleozoic Era?
Periods are divided into ____________.
What are epochs?
A scientist who studies fossils.
What is a paleontologist?
Principle that states that the intrusions or faults that cut across a rock are younger than the rock.
What is the Cross Cutting Relationships?
The first trace of life on earth can be traced back to.
Precambrian Era
Give at least 2 characteristics of a good index fossil.
Should have named at least 2 of these:
1. Easily identifiable
2. found all over the Earth
3. abundant
4. lived & went extinct during a short period of time
There are _____ (how many) eons in Earth’s history.
What is four?
When molten rock from inside the Earth cracks the rock layers then moves towards the surface.
What is an intrusion?