Dating
What kind of dating give you gives the sequencing of rocks?
What is relative dating
What is the longest era of geologic time?
The longest era is the Precambrian
What kind of fossils were found in the cambrian period?
Algae, fungi, first plant spores, trilobites, phyla, invertebrates
260 MYA earth's continents joined to form what supercontinent commonly known as
What is Pangea
an element found in silicate minerals that is also found in most rocks
What is silicon?
Younger rocks are on the tops and older rocks are on the bottom is what law
What is The law of superposition
The geologic time scale is a record of life forms and geologic events in Earth's history.
What is the geologic time scale?
In what type of rocks are most fossils found?
Most rocks are found in sedimentary rocks.
a huge meteorite that stuck earth caused the extinction of what animals
What are dinosaurs
The tendency of minerals to break along irregular or curved surfaces
What is fracture
What method of dating gives us absolute age of rocks?
What is Radioactive dating
This was used by scientist to create the geologic time scale
What is fossil evidence
the preserved remain of an organism is a...
What is a fossil?
If earth's surface had never cooled the earth would not have these
What are oceans
A solid made of particles that form a repeating pattern
what is a crystal
When magma or lava runs through many sections of rock this is called
What is cross cutting
We currently live in this era
What is the Cenozoic Era.
large reptiles (dinosaurs) peak then disappear, modern fishes appear during this time period
What is the Cretaceous Period?
The amount of oxygen in the atmosphere increased as plants began to go through this process
What is photosynthesis
The tendency of a mineral to break along a flat surface
What is cleavage?
Radioactive dating uses this process to determine the actual age of rocks
What is half-life
Earth's atmosphere, oceans and continents formed in in this time period
What is the precambrian
The name that was initially given to humans
What is Cro-Magnon
This caused the Neanderthal population to become extinct
What are respiratory infections and dominance of modern humans
Describes the way a mineral reflects light
What is luster?