The radius of the moon is one fourth and its mass is one eighty first that of the earth. if the acceleration due to gravity on the earth's surface is 9.8meter per square. what is its value on the moon's surface?

How is coal extracted from mountaintop removal mines? a. dynamite is used to create underground tunnels where miners go to extract the coal. b. dynamite is used to break apart rocks and then draglines are used to remove the broken rock and reach the coal. c. coal in mountaintops is extracted by digging strips in the landscape to reach the coal. d. placer deposits in mountain river bottoms are removed by

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

Which bonds are found inside a water molecule