In the asteroid impact theory of the extinction of the dinosaurs some 65 million years ago, the dinosaurs (and over half of all the other species on Earth at that time) died off largely because
A) of injuries suffered from direct hits of pieces of the asteroid or comet.
B) dust injected into the stratosphere from the impact absorbed visible light from the Sun, causing global temperatures to plummet.
C) radiation from iridium in the asteroid caused the dinosaurs to die of cancer.
D) the impact caused massive earthquakes and volcanic activity worldwide.
E) dust settled on the leaves of plants, making them inedible, so the animals died of starvation.
B
You might also like to view...
Magnifying Glass With the Image at Infinity: A person having a near point of 25 cm uses a magnifying glass with a focal length of 10 cm. What is the angular magnification of the glass for that person when her eyes are focused at infinity?
A. 1.5 B. 2.5 C. 3.5 D. 4.5
The dominant features of the highlands of the Moon, ________ are chiefly the result of impacts of comets and asteroids early in the Moon's history
Fill in the blank(s) with correct word
Suppose the gravitational force of the Earth on a body was 
. What escape velocity ve would a body need to escape the gravitational field of the Earth?
A.
.B.
.C.
.D.
.E.
.Gluons can emit
A. electrons. B. protons. C. gravitons. D. baryons. E. gluons.