Formation of Earth
When did the Earth form?
4.6billion years ago
What is the only planet known to support life ?
Earth
What are fossils
Fossils are preserved evidence of once living organisms
What is radiometric dating
a method of dating used to determine the age of rocks or fossils
What is the geologic time scale
is the calendar for Earths events
what is the hypothesis name for the solar system creation?
nebular Hypothesis
What is one reason that the earth can support life
The distance from the sun
Where can most fossils be found
sedimentary Rocks
What rock is radiometric data least useful for dating
metamorphic rock
What is the longest Geological era
The longest Geological era is Precambrian Era
According to the nebular hypothesis, how did the soler system form
the solar system formed from a giant rotating cloud of gasglossary term (opens in a new window) and dust, called a solar nebula.
What are some of the gasses that make up Earth Atmosphere
Nitrogen Oxygen carbon dioxide and water vaper
An organism's body does not have to be fossilized to to leave evidence of its existence ( true or false )
True
How far back can radiometric dating go?
Between 100 and 50,000 years
What period are we in now
Holocene.
What is a shockwave
A shockwave is a wave of high amplitude caused by shock
What are the stages in the water cycle
Evaporation condensation precipitation
What is an example of body fossils
Bones, teeth, claws, eggs, skin and soft tissues
How is radiometric dating used to determine the age of Earth?
Measuring the uranium-to-lead ratios in the oldest rocks on earth
What was the era that humans came to the planet
Anthropocene
What is the process of accretion
the process of growth or enlargement
What is the average surface air temperature air temperature in Celsius
15 degrees Celsiusu
What is one reason that fossils are rarely complete
One reason is that many parts of an organism decay too quickly to become fossilized.
Can every rock be dated radiometrically?
No, only igneous rocks that contain radioactive isotopes with a known half-life can be dated using radiometric techniques.
What is the name of the system used to determine when determine when a new period begins
International Geologic Time Scale