Grand Canyon
Scales and Timelines
Rocks
Fossils
100
Age of the Grand Canyon
What is 10 million years old?
100
A timescale using numbers to show how many years ago different events happened
What is a numeric timescale?
100
Rocks that can be changed due to heat and pressure
What is metamorphic, sedimentary, and igneous?
100
A type of fossil that lived for a short period of time, but in many places of the world.
What is an index fossil?
200
Age of rock layers in the Grand Canyon
What is 1.7 billion years old?
200
A timescale comparing part of Earth's history to the whole.
What is a porportional timescale
200
Rocks that can be melted into molten rock, cools, and then hardens
What is igneous, metamorphic, and sedimentary?
200
A fossil
What is a remaint or trace of a plant or animal and embedded and perserved in rock n Earth's crust.
300
Rock layers have been revealed by
What is the Colorado River?
300
The present starting point on a timeline
What is the begining of the timeline?
300
Rocks that can have sediments compacted and cemented together
What is metamorphic, sedimentary, and igneous?
300
Two rock types that usually don't contan fossils due to the heat and pressure it takes to form
What is metamorphic and igneous?
400
The Earth process that is NOT usually observed on a stream table in the classroom
What is weathering?
400
Number of Eras in the Earth History timeline
What is four eras?
400
Sedimentary rock that looks dull and feels rough;may contains fossils; and may form on or below Earth's surface
What is sandstone?
400
Age trilobites existed
What is 500 million years?
500
Captain Garcia Lopez de Cardenas
Who is the first European to vist the Grand Canyon?
500
The longest era
What is the Precambrian era?
500
Igneous rock that looks dull and feels rough; lighter than most rocks; andmade of volcano glass
What is pumce?
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