Vocabulary
Beds or layers of sedimentary rock having approximately the same composition throughout
Rock Strata
is the basic unit of geologic time. Lasts tens of millions of years, which is the time it takes to form one type of rock system.
Each one is characterized by specific fossils and is named for the location they were discovered.
Period
Any physical evidence that a plant or animal lived a long time ago
Fossil
An object’s age in relation to the age of something else.
Relative Dating
What is one third of 750?
250
Scientific law that states fossils located in deeper sediment layers are older than ones deposited in layers closer to the surface
Law of Superposition
______________ are the largest unit of geological time and last hundreds of millions of years. There are only 4 in the geologic time scale.
Eons
Ways fossils are formed:
Drying of organisms; found in deserts.
Mummification
How old is earth?
4.5-4.6 billion years old
Put in order from east to west:
Portugal, Greece, Turkey, Italy
Turkey, Greece, Italy, Portugal
Some organisms only lived on Earth during a short, specific time period. An example: Trilobite
An index fossil
Type of calendar geologists use to put events in Earth’s history in chronological order.
Geologic Time Scale
Ways fossils are created:
Animals preserved because bacteria cannot survive in cold climate to decay the bodies
Freezing
Gives us the true “age” of a fossil or rock
All you need is a tiny sample of material (mineral, bone) no larger than a grain of rice.
Absolute dating
What does "zoic" mean in the words
Paleozoic, Mesozoic, Cenozoic.
Animal life
Study of rock layers
Stratigraphy
composed of two or more periods. One is hundreds of millions of years in duration.
Era
Ways fossils are formed:
Hardened tree sap, insects get stuck in sap and sap hardens
Amber
Any feature that cuts across a body of sediment or rock is younger than the body of sediment or rock that it cuts across.
Cross cutting law
Which kids movie is set in the fictional kingdom of Arendelle?
Frozen
The mineralized remains of organisms and the rock layers in which they are found, showing when and where long-dead organisms lived and how their bodies were structured
Fossil Record
is the smallest unit of geologic time. Will last several million years
When the fossil record for a period is complete, periods can be divided into these.
Epochs
Ways fossils are formed:
When organic material is replaced with minerals
Petrification
Rocks embedded in other rocks are older than those rocks they are embedded in
Law of Inclusions
What are the next two numbers in this sequence:
16, 9, 12, 5, ___, ___
8, 1
(subtract 7, add 3)