Precambrian Era
The Earth is __________________ years old.
4.5 billion
Shallow seas came inland and covered this state
North Dakota
The Mesozoic Era is also called the ____ __ _______
Age of Reptiles
The Cenozoic Era is known as the _____ __ ________
Age of Mammals
The Quaternary Period is also known as the
________ _________
Ice Age
The study of the Earth
Geology
Plant life and __________________ began to develop.
animals
A meat eater is a ____________________
carnivore
At the end of the Mesozoic Era the earth was hit by an _________________ and dinosaurs became extinct
asteriod
Gigantic sheets of ice are called
glaciers
The Precambrian Era was the _________ and the _____________ era.
first and the longest
Layers of sand, silt, and clay were pressed into ____________________________rock.
sedimentary rock
The most common dinosaur found in North Dakota is the _____________________
Triceratops
Petrified wood is a fossil where decayed wood is replaced by ________________
minerals
The last glacier, the ___________________Glacier melted 12.000 years ago
Wisconsinan
There were no animals during the Precambrian Era but there were microscopic __________________
plants
Decayed plant and animal material were trapped in the sedimentary rock and became ____________________ _______________.
fossil fuels
Name 3 traits of a triceratops
3 horns, bony plate at the back of skull, 5 tons, herbivore, skull 7 feet long
The last of the seas drained away and left rotting vegetation. Pressure from its weight and heat from the earth turned it into _________ ___________
lignite coal
The large lake that was formed after the glacier melted was call _________________
Lake Agassiz
During the Precambrian Era, magma turned into __________________ rock.
igneous
Examples of fossil fuels are _______________ and
___________________________
petroleum (oil) and natural gas
Name 3 traits of a Tyrannosaurus
40 ft long, 20 ft high, powerful legs, arms 3 ft long, 50 to 60 sharp teeth, teeth could grow back, could eat 500 lbs of food in one bite
North Dakota's state fossil is ________________
teredo-bored petrified wood
The glacier wasn't on the southwestern part of the state so the _____________________ look very different from the rest of the state
Badlands