Sunspot numbers were lowest in this century:
A) seventeenth century.
B) eighteenth century.
C) nineteenth century.
D) twentieth century.
Answer: A
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There are electrons in the filament of the AC lamp in your bedroom. When you turn on the lamp and it glows, the glowing comes from
A) different electrons; the ones that flow in the circuit to your lamp. B) the same electrons. C) the positive charges that flow in the filament.
The Earth subsystem that represents the circulation of Earth's water throughout the hydrosphere, atmosphere, biosphere, and geosphere is know as the:
A) aquasphere. B) water rotation. C) evaporative cycle. D) hydrologic cycle.
If one topographic contour represents an elevation of 60 feet, and the next contour represents 80 feet, then the _______________ is 20 feet. (two words)
Fill in the blank(s) with correct word
Stars with a surface temperature 3000 K appear red in color
Indicate whether the statement is true or false