The drawing shows a cross section where the land meets the sea. The section covered is 5 kilometers. On a hot day, in which direction, indicated by the four arrows, is the wind most likely to blow?
Show Hint
Remember that land heats up faster than the sea, and surface wind always flows from the higher pressure (cooler) side to the lower pressure (warmer) side.
Step 1: Understanding the Question: The picture shows a coastline, with land on one side and sea on the other, and four arrows (A, B, C and D) marking different possible directions air could move in that cross section. We need to work out, using basic weather science, which of these four arrows matches the wind we would actually feel at ground level on a hot day.
Step 2: Key Formula or Approach: This is the classic "sea breeze" situation. Land heats up and cools down much faster than water. On a hot day, the land surface gets warmer than the sea surface. Warm air over the land becomes lighter and rises, creating lower air pressure at ground level over the land. The sea surface stays relatively cool, so pressure at the sea surface stays a little higher than over the land. Air always moves from higher pressure to lower pressure at the surface, so the surface wind blows from the sea toward the land. This is called a sea breeze.
Step 3: Detailed Explanation: Arrow A is a vertical arrow near the land pointing straight down, and arrow B is a vertical arrow near the sea pointing straight up. Neither of these represents the surface wind we are asked about. Arrow C is a horizontal arrow at a higher level, pointing from the land toward the sea. A flow in this direction is actually the pattern you would expect at night (land breeze), not on a hot day. Arrow D is a horizontal arrow right at the shoreline, pointing from the sea toward the land. This matches exactly what we reasoned out in Step 2.
Step 4: Final Answer: The wind at ground level on a hot day blows from the sea toward the land, which is the direction shown by arrow D.
