Briefly explain what we mean by the statement "The farther away we look in distance, the further back we look in time."
What will be an ideal response?
It means that when we look at a distant object, we see it as it was some time in the past, rather than as it is now. This is because the light we see has taken time to travel from the object to us.
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Describe the rift valleys on Mars
What will be an ideal response?
An ohm is equal to which of these?
A. A Coulomb per second B. A volt C. A volt per ampere D. An ampere per second
The intensity of sunlight falling on the earth is about 1.4 kW/m2 (before any gets absorbed by our atmosphere). At what rate does the sun emit light energy?
(The earth-sun distance = 1.5 × 108 km and the earth's radius = 6.4 × 103 km.) A) 4.0 × 1026 W B) 3.2 × 1022 W C) 7.2 × 1014 W D) 7.6 × 108 W
The hollow depression left when a shell or bone is dissolved completely out of a rock is called a(n) ______________
Fill in the blank(s) with correct word