Life probably did not originate on the land surface because
A) impacts would have destroyed any life that appeared
B) water was not plentiful on land
C) there was no ozone layer to shield out harmful UV rays
D) organic materials were not present on the land
C
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Significant Figures: In a parallel universe, the quantity ? has the value 3.14049… . Express ? in that universe to(a) four significant figures(b) five significant figures.
Fill in the blank(s) with the appropriate word(s).
The radioactive ages of the moon rocks show that the Moon's surface solidified about _____
A) 2.5 billion years ago B) 3.4 billion years ago C) 4.4 billion years ago D) 5.5 billion years ago
Rotational Kinetic Energy: The L-shaped object shown in the figure consists of three small masses connected by thin uniform rods, each rod of mass 3.00 kg. Assume that the masses shown are accurate to three significant figures. How much work must be done to accelerate the object from rest to an angular speed of 3.25 rad/s about the y-axis?
Fill in the blank(s) with the appropriate word(s).
The pattern of rising hot gas cells all over the photosphere is called:
A) filaments. B) granulation. C) sunspots. D) convective projections. E) prominences.