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definitions
definitions
questions
questions
NJ Ask Practice
100
what is bedrock
the rock layer that lies below the soil
100
what is lava
hot, melted rock material that flows from active volcanoes and other fractures in the Earth's crust; magma that has reached the surface of the Earth
100
what is sedimentary rock
rock formed from the weathered products of preexisting rocks
100
Which is the lesser unit of time: a period or an eon?
Period
100
Which equipment would be most useful for a scientist studying the crystals in a sample of granite?
Microscope
200
what is a fossil record
the complete body of fossils that shows how species and ecosystems change over time
200
what is magma
hot, molten rock material beneath the surface of the Earth
200
You find an igneous rock. It has large crystals and a very rough texture. Where was this rock most likely formed?
The rock was formed inside the earth where magma is
200
In what era did the first flowering plants appear?
Mezozatic
200
Which type of rock do paleontologists use to study past climates?
Sedimentary
300
what is geologic timescale
a table that divides the Earth's history into eras, periods, epochs, and so forth
300
what is metamorphic rock
igneous or sedimentary rock changed by pressure or heat
300
Sedimentary rock almost always forms in horizontal layers. Explain why.
Sedimentary rock are formed from bites of rock parts of animals and so on
300
Hoe many millions of years ago did the Eocene epoch start?
54.8 million years
300
Which type of rock is formed when heat and pressure changes but does not melt rock?
Metamorphic
400
what igneous rock
rock formed by the cooling of magma or lava
400
what is mineral resources
any substance extracted from the Earth
400
In what type of rock are most likely to find a fossil? Explain
Its formed in layers
400
What type of animal became extinct at the end of the Cambrain period last?
Extinction of tribites and many other marine animals.
400
On what do geologists base this system of classification
The method of formation of the rocks
500
what is an index fossil
a fossil associated with a particular span of geologic time
500
what is the rock cycle
a continuous process in which rocks change from one type to another
500
Which is the greater unit of time: an era or an epoch?
Era
500
How many millions of years did the Cambrain period last?
540 million years
500
Which equipment would be most useful for comparing the densities of a sample of granite and a sample of limestone?
Graduated cylinder and digital balance.