Hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. W
hen the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. Which two phases of the water cycle are repeated in this process?
Evaporation occurs when liquid water changes into water vapor (gaseous water or steam). Condensation occurs when water vapor changes back into a liquid (when clouds are formed). Hurricane formation, therefore, depends on the repetition of the processes of evaporation and condensation.
When water turns from a liquid phase in the oceans to gas (water vapor) in the atmosphere, this is called evaporation. When the water vapor (gas ) cools in the cooler upper atmosphere to water droplets (that form clouds), this is called condensation. Evaporation is an endothermic process while condensation is an exothermic process.
There are about 120 million rods in the human retina. The cones are not as sensitive to light as the rods. However, cones are most sensitive to one of three different colors (green, red or blue). Signals from the cones are sent to the brain which then translates these messages into the perception of color.
