题目内容

Lifting actions may be provided by several factors except _____?

A. rising terrain
B. fronts
C. convection
D. crosswind

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Thunderstorms progress three definite stages which do not include _____?

A. cumulus
B. convection
C. mature
D. dissipating

_____may be embedded or obscured by massive cloud layers.

A. cumulonimbus
B. cumulus
C. droplet
D. ice

In the cumulus stage, a lifting action initiates the ________ movement of air.

A. vertical
B. horizontal
C. lateral
D. longitudinal

Precipitation creates a _______ motion in the surrounding air.

A. upward
B. downward
C. forward
D. backward

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