Half Lives
What is a half life?
How much time it takes for 1/2 of radioactive material to decay?
Geologic periods
What is an index fossil?
2 plates moving away from one another
What is divergent boundary?
Form of relative dating
What is the law of superposition?
Stable equilibrium
What is homeostasis?
After 1 half life what percentage parent vs daughter isotope is there?
How much is 50% and 50%?
Igneous or metamorphic rock
What is disconformity?
Subduction zone
What is transform boundary?
Geologic feature which cuts another is the younger of the two features. It is a relative dating technique in geology
What is the principle of cross cutting relationships?
The trapping of the sun's warmth in earth's atmosphere
What is the greenhouse effect?
After 2 half lives what percentage parent vs daughter isotope is there?
How much is 25% and 75%?
Horizontally parallel strata of sedimentary rock are deposited on tilted and eroded layers
Angular unconformity
Knowing the age of the rock by looking at the fossils and rock around it
What is relative age?
Earth's outer shell is divided into several plates that glide over the mantle
What is the theory of plate tectonics?
Acidic rainfall made by atmospheric pollution
What is acid rain?
After 3 half lives what percentage parent vs daughter isotope is there?
How much is 12.5% and 87.5%?
Buried erosional or non-depositional surface separating two rock masses or strata of different ages
Nonconformity
San Andreas Fault
What is transform boundary?
(Created at mid-ocean ridges) As plates diverge at these ridges, magma rises into the upper mantle and crust. As it moves away from the ridge, the lithosphere becomes cooler and denser, and sediment gradually builds on top of it.
What is oceanic crust?
Layer of the atmosphere that protects earth and everything in it
What is the ozone layer?
After 4 half lives what percentage parent vs daughter isotope is there?
How much is 6.25% and 93.75%?
Knowing the age of a rock by viewing the rock and fossil around it
What is relative age?
Andes Mountains
What is convergent boundary?
The exact age of a rock
What is absolute age?
The depletion of this could cause major skin cancer