The longest days of the year in the Northern Hemisphere are experienced at the
A) time that the Sun is directly overhead at the Tropic of Cancer.
B) vernal equinox.
C) autumnal equinox.
D) time of 24-hour days at the South Pole.
E) winter solstice.
Question 2
Which of the following describes the pressure gradient force?
A) It drives air from areas of higher to lower barometric pressure.
B) It is the only force acting on atmospheric flows in the upper troposphere.
C) It causes apparent deflection of winds from a straight path.
D) It decreases with height above the surface.
Changes in Earth's atmospheric carbon dioxide levels over geological time.
DNA replication is the basis for the perpetuation of life through time
Portrait of Typical 12-year-old Boy and Girl, 1981 and 2007-2009
Research that has examined babies' ability to recognize themselves develops in the 2 year
The Cosmic Calendar: Concepts of Time