Wegener also noted that the continents move up and down to maintain equilibrium in a process called isostasy. As an example he cited the sinking of Northern Hemisphere lands under the weight of continental ice sheets in the last ice age, and their rise since the ice melted some 10,000 years ago.
Drill that is fitted with a Pipe provides effective connection to the rig surface equipment or application with the bit and the bottom hole assembly for the purpose of pumping the Drill fluid to the bit.
Found This Helpful. A hand drill is a fastening tool used to secure screws or bolts. It can also be used with a drill bit to tighten fasteners, and can be used with stirring attachments to mix paint and joint and other liquid materials, such as glazing materials for ceramics.