Measurements of carbon dioxide concentrations in our atmosphere over the past 800,000 years show
A) an indirect correlation with global surface temperatures
B) a direct correlation with global surface temperatures, only over the past century
C) no correlation with global surface temperatures
D) a direct correlation with global surface temperatures
D
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Without the greenhouse effect operating in our atmosphere
A) We would not have to worry about any warming problems in the future. B) Earth would have an average temperature of -23 degrees Celsius. C) The ice in the polar regions would have melted long ago. D) The ozone layer would not be weakening. E) The Earth would have become much more like Venus long ago.
A lens that is curved inwards at the center on both sides so that the lens has greater thickness at its edges is called
a) a convex lens. b) a refracting lens. c) a converging lens. d) a concave lens.
The expansion of the universe means that stars in our Milky Way Galaxy are getting increasingly farther apart
Indicate whether the statement is true or false
Ionization from the ____________________ star in the Orion nebula makes it ____________________ brightly
Fill in the blank(s) with correct word