Test 2 Answers - temperature and rainfall

MARK SCHEME
1		Study Fig. 1 and Fig. 2, which shows the locations and the average monthly temperatures of two cities in Canada, Saskatoon and Vancouver respectively.
		Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Saskatoon -20 -14 -7 4 12 16 19 17 11 5 -6 -15 Vancouver 3 5 8 10 13 16 20 18 16 11 7 4
		*Temperatures in Degrees Celsius (°C)
Fig. 2
		(a)	Using data from Fig. 2, calculate the annual temperature range for both cities.	[2]
			·   Saskatoon has an annual temperature range of 39°C. ·   Vancouver has an annual temperature range of 17°C. Perfect answers: Tommy, Ting Ting, Darren, Jit Lin
		(b)	Using Fig. 1, account for the difference in the annual temperature range for both cities.	[5]
			·   Vancouver has a lower annual temperature range as compared to Saskatoon as it is located near the coast and experiences the maritime effect. ·   During summer, the land heats up faster than sea and cooler air over the sea will lower temperature of land. ·   During winter, the sea loses heat slower than the land and the warmer air over the sea will raise temperature of land. ·   As a result the temperature in Vancouver during summers are cool while its winters are mild. ·   Saskatoon has a continental effect and has a hotter summer and colder winter. ' Good try: Sophiann, Jia Wen, Junjie, Damien, Darren
			Account: Means to explain the reason why (some of you calculated the difference)
2			With the aid of a diagram, explain the formation of relief rain.	[6]
			·        1mk for diagram ·   Warm, moist air is forced to rise over landforms such as mountain range. Moist air travels over the sea and reaches the coast. ·     The air rises up the windward side of the mountain and is forced to cool. ·      When temperature of the air reaches dew point, condensation occurs and clouds form. ·    When droplets become large and heavy, they fall as rain on the windward side of the mountain. ·      The other side called the leeward side is usually dry as it does not receive rain.
3			Explain how high altitude can cause a lowering in temperature	[2]
			·        At high altitude, the air is less dense. ·        Less dense air has less ability to trap heat and temperature is lower. Perfect answer: keefe, sophiann, Jit Lin Marking amendments: Accept answers about solar radiation/ ground is heated nearer to earth's surface