Reptiles evolved from amphibians about
A) 475 million years ago
B) 542 million years ago
C) 360 million years ago
D) 245 million years ago
D
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In the giant impact theory of the Moon's origin,
a. the Moon broke from a rapidly spinning Earth b. the Earth and its Moon formed from the same cloud of matter c. the Moon formed elsewhere in the solar nebula and was later captured by Earth. d. the Moon formed when a very massive planetesimal smashed into the young Earth.
A large luminosity star
a) is always at a larger distance than a small luminosity star b) emits more light than a low luminosity star c) is always redder than a star with a small luminosity d) is at a lower temperature than a small luminosity star e) is always at a smaller distance than a small luminosity star
Plane Mirrors: David stands 2.5 m in front of a plane mirror.(a) How far from David is his image in the mirror?(b) If David moves away from the mirror at 1.5 m/s, how fast are David and his image moving apart from each other?(c) If David is 180 cm tall, how tall is his image in the mirror?
What will be an ideal response?
The physical disintegration or fracturing of rock is called
a. mechanical weathering. b. gradation. c. chemical weathering. d. none of these.