What is the top layer of the Grand Canyon contain?
100
Form when a molten rock cool and hardens.
How do igneous rocks form?
100
Contains fossils.
What is sedimentary rock?
200
These form when Metamorphic, Igneous, and Sedimentary rock weathers, erodes, moves, and settles.
What are sediments?
200
This is when the first vertebrates appeared.
When is 480 mya?
200
Vishnu.
What is the oldest layer of the Grand Canyon?
200
The crust.
What is the hardest rock layer?
200
A fossil that has existed for a short period of time in many places around the world.
What is an Index Fossil?
300
The removal and transportation of loose Earth material.
What is erosion?
300
4.5 billion years ago.
When was Earth formed?
300
River flowing through the Grand Canyon.
What is Colorado River?
300
Forms due to heat and or pressure.
What is Metamorphic?
300
The remains or traces of organisms that have been preserved in Earth's crust.
What is fossil?
400
A crack in the ground formed by a narrow or thin piece of ice.
What is ice wedging?
400
the longest era in Earth's history.
When is the Precambrian era?
400
This place is 277 miles long and 18 miles wide.
What is the length and width of the Grand Canyon?
400
This cycle is a series of processes that cause rocks to change from one type to another. Has been going on since Earth formed. It will continue as long as Earth exists.
What is the rock cycle?
400
This is useful to scientists because they provide evidence of the ages of rock layers.
What is the reason that fossils are important to scientists?
500
The main ingredient is calcium carbonate(calcite).
What is the main ingredient in limestone?
500
The second period in the Paleozoic era from the time Earth formed.
When is the Pennsylvanian period?
500
One of the seven natural wonders of the world and one of our planet's most astounding accomplishments.
What is the Grand Canyon of the Colorado River?
500
Formed when particles are compacted and cemented together.