When referring to air pressure, what is a high, a low, a ridge, and a trough?
a) High pressure: sinking air, low pressure: rising air, ridge: elongated area of high pressure, trough: elongated area of low pressure
b) High pressure: rising air, low pressure: sinking air, ridge: elongated area of low pressure, trough: elongated area of high pressure
c) High pressure: sinking air, low pressure: rising air, ridge: elongated area of low pressure, trough: elongated area of high pressure
d) High pressure: rising air, low pressure: sinking air, ridge: elongated area of high pressure, trough: elongated area of low pressure
