Emotional stimuli is the answer to your question.
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Submarines use <span>buoyancy by filling ballast tanks up with water. When they are filled with water, they are more dense than the surrounding water, so they are able to sink. If they want to rise, they fill these tanks up with air so that the density is less than the water it surrounds.
Hope this helps! :)</span>
An occluded front forms when a cold front catches up with a warm front. So it would bring Sun and warmth.