What are extrusive rocks?
What will be an ideal response?
Outside rocks that has lava hardening near on the Earths surface where it is exposed to lower temperatures
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On a particularly foggy day the visibility is ¼ mile. This means that 95% of the visible light is absorbed after traveling ¼ mile. What is the extinction coefficient for the atmosphere?
What will be an ideal response?
Why do some of the bright stars (such as the one indicated by the arrow) in this photo have cross-shaped spikes over them?
A) The spikes are an artifact of photography through a telescope. B) The spikes are flares ejected from the surfaces of bright stars. C) Very bright stars tend to be slightly nonspherical in shape and therefore look like they have spikes in photos. D) The stars with spikes are actually binary star systems.
A delivery truck and a car collide. Which vehicle experiences the greater acceleration?
A. the car B. the truck C. Both the car and the truck experience the same acceleration. D. We need to know the speed of the truck and the car to find the answer. E. We need to know the mass of the truck and the car to find the answer.
Eons are divided first into
a. eras. b. periods. c. millennia. d. epochs.