Air pressure at the Earth's surface is different in different places and this is partially due to the different amounts of heat they receive from the sun. When the Sun heats up the Earth, the air above warms, becomes less dense, expands and rises. The air above is pushed upwards and then spreads out horizontally. Because of this horizontal air movement there is less air above the ground where the heating took place and this leads to an area of low pressure. As the air rises, it cools. As it cools, the air becomes more dense and sinks. This sinking means that there is more air above the ground in this area and a region of high pressure is formed. Air moves from high pressure areas to low pressure regions to even out the pressure differences, generating winds and atmospheric circulation as a result.
The same behaviour happens on a smaller scale during the formation of sea breezes during the day and land breezes during the night and these are shown in the animation below. During the day, the land heats up faster than the sea, warming the air above. During the night, the sea cools slower than the land so the air is warmer over the sea compared to the land. In both cases, the warm air rises and leaves an area of low pressure (L) below. Air from higher pressure (H) regions moves towards the low pressure regions to even out the pressure differences. At higher altitudes the air is transported back in the opposite direction.
Answer:
The region where the embryoblast contacts the trophoblast is called the embryonic pole. ... Just before implantation, the cells in the embryoblast start to differentiate into two layers - the epiblast (primary ectoderm), and an internal layer of cuboidal cells called the hypoblast (or primary endoderm).
The advantage for the reduced gametophytes in seed plant is that they gain nutrients from the sporophytes
Gametophytes are microscopic and have capacity to develop from spores retained in the sporangia of parental sporophyte. This kind of arrangement protect developing gametophyte from environment stress which enable it to gain nutrient from sporophyte.
Answer
Crater
Explanation
When there is a volcanic eruption, lava , gases, ash and rocks are released on to the surface as super hot mix. The material that has been pulled out of the earth surface form visible volcanic land forms which include caldera, craters, lava domes and lava plateaus.
Air also affects evaporation,If a air pressure is high on the surface of a body of water,then the water will not evaporate easily.The pressure pushing down on the water makes its difficult for water to escape into the atmosphere as vapor... Temperature,of course,affects how quickly evaporation happens.