Focus On Earth Science: California Grade 6

Lesson 3: Air Currents

Standards Check

1.
One reason Earth's surface is heated unevenly is that _______. 4.d
A)convection currents only occur near the poles
B)convection currents only occur near the equator
C)different materials absorb different amounts of solar radiation
D)oceans reflect far more sunlight than sand
2.
Winds are caused when air _______. 4.e
A)is a good conductor of heat
B)moves from low pressure to high pressure
C)emits infrared radiation
D)moves from high pressure to low pressure
3.
The deflection of winds caused by Earth's rotation is called _______. 4.d
A)a Hadley cell
B)the Coriolis effect
C)a convection current
D)the greenhouse effect
4.
What percentage of the Sun's radiation that reaches Earth is reflected back into space? 4.b
A)30 percent
B)50 percent
C)70 percent
D)5 percent
5.
An inversion occurs when _______. 4.d
A)warm air is on top of cold air
B)cold air is on top of warm air
C)warm air sinks
D)cold air rises
Grade 6
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