Why is the north and south poles have cold climates?

Which element would mostly likely have an electron affinity measuring closest to zero

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.i