The iridium layer at the Cretaceous-Tertiary boundary is attributed to
A) meteorite bombardment.
B) massive volcanic eruptions.
C) massive earthquakes and shock waves.
D) extinction of the dinosaurs.
Answer: A
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The Sun's surface seethes and churns with a bubbling pattern. Why?
A) We are seeing hot gas rising and cool gas falling as a result of the convection that occurs beneath the surface. B) The Sun's surface is boiling. C) The churning gas is being stirred up by the strong solar wind. D) The churning is an illusion created by varying radiation; the gas on the Sun's surface is actually quite still.
A car is traveling along a highway at 65 mph. What is the linear speed of the bottom of the tires?
What will be an ideal response?
How is the direction of a magnetic field defined?
Air at 30°C and 200 kPa is flowing in a 30-cm-diameter pipe and passes through the bend shown. An estimate of the pressure difference between the inside of the bend and the outside of the bend is approximately:
(A) 110 Pa
(B) 140 Pa
(C) 180 Pa
(D) 240 Pa