What causes the annual growth rings of trees? Different growth rates at different times of the year Damage caused by fungi that occurs during the wetter months Residual bark left over when the trunk of the tree expands Sugars left over from the previous summer

Hydrosphere is the correct answer

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on

Droughts cause very arid places such as a desert