If re were no mountains or oceans and if winds circled earth with perfect regularity n amount of heat and length of farmer's growing season would progress uniformly from north to south. Instead, re are all kinds of unexpected differences in climate, as temperature maps of United States show. For instance, all along western coast, temperature changes little between winter and summer. In some places, average difference between July and January is as little as 10 degrees centigrade. The climate along norrn part of this coast is similar to that of England. But in north central part of country, summer and winter are worlds apart. There average difference between July and January is 36 degrees centigrade and more violent extremes are common. The coldest days of a typical January may be 4 degrees centigrade, and hottest July day may be 45 degrees. This is sort of climate that is also found in central Asia, far from moderating influence of oceans. In eastern part of United States, difference between summer and winter is also very distinct, but not nearly so extreme. Near southwestern corner of country, climate is mild and spring-like in winter, but In summer temperature may reach equatorial intensity. In Alaska, almost continues daylight in summer makes short growing season an intense one. The variations in temperature within United States have had a marked effect on country's economy and living standards.
Question:

As referred to by passage, climate is prone to changes resulted from :

If there were no mountains or oceans and if the winds circled the earth with perfect regularity then the amount of heat and the length of the farmer's growing season would progress uniformly from north to south. Instead, there are all kinds of unexpected differences in climate, as temperature maps of the United States show. For instance, all along the western coast, the temperature changes little between winter and summer. In some places, the average difference between July and January is as little as 10 degrees centigrade. The climate along the northern part of this coast is similar to that of England. But in the north central part of the country, summer and winter are worlds apart. There the average difference between July and January is 36 degrees centigrade and more violent extremes are common. The coldest days of a typical January may be 4 degrees centigrade, and the hottest July day may be 45 degrees. This is the sort of climate that is also found in central Asia, far from the moderating influence of the oceans. In the eastern part of the United States, the difference between summer and winter is also very distinct, but not nearly so extreme. Near the southwestern corner of the country, the climate is mild and spring-like in winter, but In summer the temperature may reach equatorial intensity. In Alaska, almost continues daylight in summer makes the short growing season an intense one. The variations in temperature within the United States have had a marked effect on the country's economy and living standards.
Question:

........summer and winter are a world apart." This part of the sentence in the passage gives the meaning similar to

If re were no mountains or oceans and if winds circled earth with perfect regularity n amount of heat and length of farmer's growing season would progress uniformly from north to south. Instead, re are all kinds of unexpected differences in climate, as temperature maps of United States show. For instance, all along western coast, temperature changes little between winter and summer. In some places, average difference between July and January is as little as 10 degrees centigrade. The climate along norrn part of this coast is similar to that of England. But in north central part of country, summer and winter are worlds apart. There average difference between July and January is 36 degrees centigrade and more violent extremes are common. The coldest days of a typical January may be 4 degrees centigrade, and hottest July day may be 45 degrees. This is sort of climate that is also found in central Asia, far from moderating influence of oceans. In eastern part of United States, difference between summer and winter is also very distinct, but not nearly so extreme. Near southwestern corner of country, climate is mild and spring-like in winter, but In summer temperature may reach equatorial intensity. In Alaska, almost continues daylight in summer makes short growing season an intense one. The variations in temperature within United States have had a marked effect on country's economy and living standards.
Question:

As referred to by passage, climate is prone to changes resulted from :

If there were no mountains or oceans and if the winds circled the earth with perfect regularity then the amount of heat and the length of the farmer's growing season would progress uniformly from north to south. Instead, there are all kinds of unexpected differences in climate, as temperature maps of the United States show. For instance, all along the western coast, the temperature changes little between winter and summer. In some places, the average difference between July and January is as little as 10 degrees centigrade. The climate along the northern part of this coast is similar to that of England. But in the north central part of the country, summer and winter are worlds apart. There the average difference between July and January is 36 degrees centigrade and more violent extremes are common. The coldest days of a typical January may be 4 degrees centigrade, and the hottest July day may be 45 degrees. This is the sort of climate that is also found in central Asia, far from the moderating influence of the oceans. In the eastern part of the United States, the difference between summer and winter is also very distinct, but not nearly so extreme. Near the southwestern corner of the country, the climate is mild and spring-like in winter, but In summer the temperature may reach equatorial intensity. In Alaska, almost continues daylight in summer makes the short growing season an intense one. The variations in temperature within the United States have had a marked effect on the country's economy and living standards.
Question:

The passage can best be entitled