<span> Japan has significant coastal waters, which provide the country with fish and other seafood. However, the demand for fish is so high that it must be supplemented with imports from abroad. Although Japan has a small amount of arable land, the country has some of the highest crop yields in the world, producing over 60 percent of its own food each year. The country has adequate supplies of gold, silver, and magnesium, but it must import many of the minerals essential to its booming electronics industry, such as iron ore and copper.</span>
By observing how seismic waves are absorbed and refracted, scientist have been able to work out where the properties of the earth change dramatically. our understanding of the internal structures of the earth and the size of its core is based on these observations.
basically:
size of core
structure of the earth I.e. the layers of the earth
and I think the last one is how the internal structure is changing? not sure on the last one but its still a solid guess.
Equator - its degree is 0 degree
The answer is A, four weeks (the lunar cycle is about 29.5 days).
