Which of the following descriptions applies to sunspots?
A. They are warmer regions on the sun's surface.
B. They are located in regions of strong magnetic fields.
C. They reach a maximum size approximately every 15 years.
D. They appear lighter than the rest of the sun's surface.
Answer: B
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Complex arrangements of feeding patterns in ecosystems are best described as
a. food webs b. food chains c. trophic levels d. pyramids of energy e. trophic chains
Two objects have the same temperature. Object A feels colder to the touch than object B. Which of the following properties may explain this difference between the two objects?
A. latent heat B. thermal conductivity C. specific heat D. density
Which of the following is the name for the maximum pressure that water vapour molecules exert when the air is saturated?
A. boiling point B. absolute humidity C. mixing ratio D. saturation vapour pressure
Which of the following processes could result in a felsic magma?
a. partial melting of an intermediate-composition source b. partial melting of continental crust c. formation and settling of mafic crystals in an intermediate magma d. all of these