Which circumstance most directly contributed to the environmental hazard of acid rain in eastern europe? a) the use of nuclear energy b) the lack of coal reserves c) the lack of oil and natural gas reserves d) the increase in mechanized farming

What important discovery was made by edmond halley and alexis clairaut, using newton's ideas of mathematics and gravity? they created the scientific method to outline how science should be conducted. they were able to find the orbit of a comet and predict the year of its return. they discovered the three newest planets--uranus, neptune, and pluto. they explained why objects appear to have color.