When do spring tides occur? How much tidal variation is noted?
What will be an ideal response?
When Earth, Moon, and Sun are aligned, at new and full phases. The difference between high and low tides is large.
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The earliest evidence for life on Earth dates to
A) about 4.5 billion years ago. B) about 3.8 billion years ago. C) about 2 billion years ago. D) about 570 million years ago. E) about 65 million years ago.
Blue stars are hotter than red stars
a. True b. False Indicate whether the statement is true or false
During retrograde motion, the planet Mars rises in the west and sets in the east.
Answer the following statement true (T) or false (F)
Which of the following statements about the moon is correct?
a. The moon experiences a centripetal acceleration toward earth. b. The moon has constant velocity c. There is no net force acting on the moon. d. Earth exerts a stronger force on the moon than the moon exerts on earth.