1)The most widely accepted theory for how Iridium dust settled over the planet in a thin layer is called a. Supernova Theory

b. Volcanism Theory

c. Asteroid Theory

2)When 2 sets of data follow the same pattern a exists between two variables.

a. coincidence

b. casual link

c. correlation

d. accident

e. causation

3) Tsunamic debris, shocked quartz and glass spheres are all evidence of mass extinction.

True

False

4)Mass extinction is when a small number of different species becomes extinct over a long period of time.

True

False
p hel its timed