What defines the boundaries between each of the three eras in the geologic timescale?
A. a decision by the Geological Society of America
B. two great mass extinctions
C. principles of relative dating
D. the age of the Earth divided by three
Answer: B
Environmental & Atmospheric Sciences
You might also like to view...
List or describe at least five ways that we can protect tropical forests and begin to slow their destruction and loss
What will be an ideal response
Environmental & Atmospheric Sciences
What separates a fracture zone from a cleavage or foliation?
What will be an ideal response?
Environmental & Atmospheric Sciences
Runoff in areas of shale bedrock tends to be less that in areas of gravel because of the high porosity of shale
Indicate whether the statement is true or false
Environmental & Atmospheric Sciences
________ is a hazardous waste dumping site in New York, famous as an example of the environmental consequences of indiscriminant disposal of wastes
Fill in the blank(s) with correct word
Environmental & Atmospheric Sciences