Earth history
Earth history 2
Rock Cycle
Rock Cycle
Vocabulary
100
The age of planet Earth.
What is 4.5 Billion years?
100
This marine creature roamed the Earth about 520 million years ago. 
What is a trilobite?
100
This type of rock forms when molten rock cools and hardens.
What is igneous rock?
100
This type of rock has two different names based on where it's formed.
What is intrusive igneous and extrusive igneous rocks?
100
The way in which light reflects off a minerals surface.
What is luster?
200
The first organisms to inhabit Earth.
What is single celled bacteria?
200
These giant reptiles nicknamed "terrible lizards" lived 65 million years ago, but died off due to a meteor and a series of volcanic eruptions.
What are the dinosaurs?
200
The processes in which rocks form.
What is the rock cycle?
200
This mineral makes up sedimentary rocks.
What is sediments?
300
The longest era in Earth's history.
What is the Precambrian era?
300
According to the time line these land inhabiting plants once resided on Earth 570 million years ago.
What is the first vascular land plant?
300
This rock type of rock is formed due to extreme heat or pressure.
What are metaphoric rocks?
400
This atompsheric layer protects Earth?
What is the ozone layer
400
The Earth was just a planet of molten rock and lava until water started to form on Earth about this many years ago.
What is 3.8 billion years?
400
This type of rock is formed when sediments are compacted and cemented together. Often contains fossils.
What are sedimentary rocks?
500
The two main reasons why the dinosaurs went extinct.
What is a meteor and volcanic eruptions?
500
This type of rock forms due to extreme heat and or pressure.
What is metamorphic rock?
500
The tendency of a mineral to break into irregular pieces.
What is a fracture?
500
These four characteristics makes up a mineral.
What is a solid, forms in nature, has a define chemical make up, and a crystal structure?
500
This process occurs when water, wind or chemicals break off bits of rock.
What is weathering?