The effect of periodic changes in the earth’s orbital eccentricity and magnitude and direction (precession) of its axial tilt on the advance and retreat of ice sheets was first proposed by .

The distance d that a car can travel in a certain amount of time t can be found by multiplying the rate of speed r by the travel time. if a car has already travel 4 miles, the formula for the total distance travel is d= rt + 4. which of the following gives the value of r, in terms of d and t?

Late at night some traffic signals change patterns and become ?

An ancient marble statue is moved from a rural location to a highly polluted city explain how the move might affect the statue and why you think so