water vapour/ cold /and a condensation medium
Air, water and warmth must be present for germination to take place.
pressure gradient
everything
The plural form for the noun must is musts. The word must is also a verb, an auxiliary verb, and an adjective.
The changes to the rock must occur in solid form.
poo on bread
water vapour
Oxygen
For the oxidation of iron to occur, that is for ferric oxide to form, there must be oxygen present. There must also be water present.
The Sun
For a thunderstorm to form, three key conditions must be present: sufficient moisture in the lower atmosphere to provide humidity, instability to allow warm air to rise rapidly, and a lifting mechanism, such as a cold front, warm front, or topography, to initiate the upward movement of air. These factors work together to create the necessary conditions for thunderstorm development, leading to the formation of cumulonimbus clouds and potential severe weather.
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