It is possible to use human hand to estimate angles on the sky. on average, how many degrees are measured between the knuckles of your index and little fingers：

a. 1 degree b. 3 degree c. 6degree d.10degree e.30degree

Which is the first surface that has the potential to come into contact with solar radiation? a. icebergsb. cloudsc. the oceand. land

Both pictures below were taken at the same time of day, but one picture was taken in summer, and the other in winter. how can you tell which is in winter

The caste system in india was used for what purpose? a) to ensure that all people had an adequate income b) to prevent the rich from taking too much power c) to provide social control and conformity according to one’s birth d) to draft a military capable of defending india from mongol invasion