When viewed through an optical telescope, planetary nebula ________
A) still have planets orbiting the cloud
B) look like giant planets such as Jupiter
C) have visible planets within their cloud of debris
D) show the explosive form of the dead sun
E) are spherical in form and often have "rings" like Saturn
B
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_____ was established to import, refine, and distribute oil products in Brazil.
A. Petrobas B. BP (Brazilian Petroleum) C. Amazonia D. The Ministry of Petroleum Resource Management
Approximately 75% of the United States' land area is covered by forests.
Answer the following statement true (T) or false (F)
Which of the following statements is true of electromagnetic radiation?
A) All electromagnetic radiation has the same energy. B) As the wavelength of the radiation increases, the energy of the radiation decreases. C) As the wavelength of the radiation increases, the energy of the radiation increases. D) There is no specific relationship between wavelength and energy.
The depth at which the rate of photosynthesis balances the rate of plant respiration is known as the ________.
A. saturation value depth B. photosynthesis cutoff depth C. compensation depth D. gas equilibrium depth E. None of these is correct.