In which decade were the first important laws passed to decrease water pollution?
a 1950
b 1960
c 1970< <
d 1980

Simple astronomical telescope the objective lens has a focal length of 75 cm and that of a piece of 5cm of the lenses are 18 cm apart when will be final image of a distant object before

When the soviets created the borders of their central asian and caucus republics, the paid little attention to where each region’s ethic group lived. ethnic-related disputes exist along every sherd boundary in central asia. true false

Look at the map above. which of the following statement is true