The Cretaceous extinction that wiped out 60% of Earth's species (including the dinosaurs) is attributed to
A) the break-up of Pangaea.
B) meteorite bombardment.
C) massive volcanic eruptions.
D) all of the above
Answer: D
You might also like to view...
Transformers: An ideal transformer with 120 turns in its secondary supplies 12 V at 220 mA to a toy train. The primary is connected across a 120-V wall outlet.(a) How many turns are in the primary?(b) What is the primary current?(c) What power is delivered by the wall outlet?
What will be an ideal response?
How long does it take for the Moon to go from new phase to first-quarter phase?
If one were told the object's initial velocity then one could calculate the work done by using the equations for constant acceleration to find the distance traveled. When we say work is done by a force, we mean the force does
a. all the work c. negative work b. positive work d. zero work
The lunar highlands are composed primarily of ________.
A. olivine B. anorthosite C. silicon dioxide D. basalt