Shadows and solar terms

Question 1:C?

Question 2: B?

Question 3: a?

Test analysis:

Question 1: The earth revolves around the sun at the same time, which is called the rev

Question 1:C?

Question 2: B?

Question 3: a?

Test analysis:

Question 1: The earth revolves around the sun at the same time, which is called the revolution of the earth. The phenomena produced by the revolution of the earth are the change of seasons and the change of the sun's altitude angle. When the sun shines directly on the Tropic of Cancer, it is the summer solstice in the northern hemisphere, and the height angle of the sun is the largest in the northern hemisphere, so the shadow of the school flagpole is the shortest at noon. When the sun shines directly on the tropic of Capricorn, it is the winter solstice in the northern hemisphere. On this day, the sun's altitude angle in the northern hemisphere is the smallest, so the shadow of the flagpole in the school is the longest at noon; When the sun shines directly on the equator, it is the vernal equinox or autumnal equinox in the northern hemisphere. On this day, the solar altitude angle in the northern hemisphere is between the winter solstice and the summer solstice, so the noon shadow length of flagpoles in schools is also between the winter solstice and the summer solstice. Therefore, it can be judged that A in figure 1 is the shadow length measured from winter to the sun, B and C are the shadow lengths measured at the vernal equinox or the autumnal equinox respectively, and D is the shadow length measured from summer to the sun.

Question 2: The earth revolves around the sun at the same time, which is called the revolution of the earth. The phenomena produced by the revolution of the earth are the change of seasons and the change of the sun's altitude angle. When the sun shines directly on the Tropic of Cancer, it is the summer solstice in the northern hemisphere. On this day, the height angle of the sun is the largest in the northern hemisphere, so the shadow of the school flagpole is the shortest at noon. When the sun shines directly on the tropic of Capricorn, it is the winter solstice in the northern hemisphere. On this day, the sun's altitude angle in the northern hemisphere is the smallest, so the shadow of the flagpole in the school is the longest at noon; When the sun shines directly on the equator, it is the vernal equinox or autumnal equinox in the northern hemisphere. On this day, the solar altitude angle in the northern hemisphere is between the winter solstice and the summer solstice, so the noon shadow length of flagpoles in schools is also between the winter solstice and the summer solstice. Therefore, it can be judged that A in figure 1 is the shadow length measured from winter to the sun, B and C are the shadow lengths measured at the vernal equinox or the autumnal equinox respectively, and D is the shadow length measured from summer to the sun. As can be seen from Figure 2, the length of the flagpole shadow in the figure is the same as that in Figure 1, so it can be judged that the date of measuring the flagpole shadow in Figure 2 is the winter solstice; Option A stands for summer solstice, B stands for autumnal equinox, C stands for winter solstice, and D stands for vernal equinox.

Question 3: The Mediterranean coast is a Mediterranean climate zone, characterized by hot and dry summer and mild and rainy winter. The main recharge way of rivers is rainwater, and the water quantity of rivers is directly proportional to the precipitation. The midpoint of the picture is 65438+ 10 month, when the Mediterranean coast is in winter, the climate is mild and rainy, and the river water volume is the largest.