This sedimentary rock is formed when particles of sand are compacted and cemented together.
What is sandstone?
100
The remnant of a prehistoric organism preserved in a rock.
What is a fossil?
100
This is a series of processes that cause rocks to change from one type to another.
What is the rock cycle?
100
This shows how many years ago different events happened.
What is a numeric time scale?
100
This scientist thought that Earth was once completely molten, and was slowly cooling.
Who was Kelvin?
200
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This rock cannot be formed without calcium carbonate.
What is limestone?
200
The type of rock in which fossils are usually found.
What is sedimentary rock?
200
The three main types of rock.
What are igneous, metamorphic, and sedimentary rocks?
200
This shows how different parts of Earth's history compare to the whole.
What is a proportional time scale?
200
This scientist believed that the continents were once together, then drifted apart.
Who was Wegener?
300
This intrusive igneous rock is made of quartz, feldspar, and biotite mica.
What is granite?
300
A fossil of an organism that lived in many places around the world for a short period of time.
What is an index fossil?
300
This is the main difference between the types of rocks.
What is formation?
300
Earth's history is divided into these.
What are eras?
300
This scientist thought that Earth was much older than religious leaders claimed long ago.
Who was Hutton?
400
This extrusive igneous rock is rough and lighter than most other rocks. It floats, contains lots of small holes, and is similar to scoria.
What is pumice?
400
Seashell fossils are likely to form this type of rock.
What is limestone?
400
The idea that newer rock layers form on top of older ones.
What is superposition?
400
These organisms have existed for approximately 200,000 years.
What are humans?
400
This scientist was the first to define fossils as remnants of solely prehistoric organisms. He is called the "Father of Paleontology."
Who was Lamarck?
500
This metamorphic rock forms when slate changes due to heat. It is shiny, has flat crystals, and small pieces flake off easily.
What is schist?
500
If Rock Layer A and Rock Layer B both contain the same index fossil, and are in two different locations, both of these rock layers most likely have this in common.
What is relative age?
500
Most rocks are made of this. It is the main similarity between the three rock types.
What are minerals?
500
This is the longest era in Earth's history.
What is the Precambrian time?
500
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This scientist was the first to discover index fossils.