Planet rock dating review
Photo by Phil Medina Volcanic time markers - a layer of volcanic dust covering layers.
When a violent eruption of a volcano occurs it may send dust high into the atmosphere where it can spread over the entire planet.
First, there was a popup when I first hit the tour page and I despise popups.
Second, the member's area has evolved into a hub for the entire network.
Mass Extinctions There have been several mass extinctions that have caused widespread endings to species.
Lex Steele is a badass with a big gun between his legs.
Something happens to uplift the area: folding faulting, etc.
Erosion wears away the uppermost layers Area submerges and deposition begins again. The almost vertical layers on the bottom formed first.
The fuzzy line is contact metamorphism where the hot magma "fried" the surrounding rock and changing it to metamorphic rock (ex. This image shows an igneous intrusion cutting through sedimentary layers.
Ways of Measuring Absolute Time Varves- Layers in sedimentary rock that were formed in a lake. sand in the spring from high rain volume and silt deposited in the winter when the top is covered in ice and water flow stops.) C is only used for organic material Evolution Evolution is the changing pattern of life forms.
Natural Selection - First proposed by Charles Darwin - life forms best adapted to survive will continue to reproduce.
Life begins as single cells about 3.5 Billion Years ago. Most of the life that has evolved (99.9%) has become extinct.
Ex.: Cro-Magnon Man is extinct because they evolved into modern Homo-sapiens.