How do ridges and trenches form?

Answer 1

They are formed at destructive plate boundaries where one plates subducts under another. The deep sea trench marks the point at which the denser plate ( or faster plate when it is oceanic vs. oceanic) begins to subduct the lighter one. They are very long, narrow and steep-sided How_are_deep_sea_trenches_are_formedin the ocean floor.

Answer 2

In a World War I context, trenches were primarily made with hand-tools by infantrymen on either side of the conflict. Infrequently, natural ravines or terrain-dips, as well as craters resulting from cannon-fire or other causes, were made use of in the formation of a trench line.

Answer 3

To create a trench, the soldiers must go through the following steps; # Dig a rectangular hole in the ground, about three to four feet in width, stretching as long as needed in length. # Place duckboards (flat pieces of wood) along the bottom of the trench. This was done to try to keep the soldiers feet dry. # Place sandbags along the top of the trench (this was known as the parapet). # In the space between the trenches, places tangles and rolls of barbed wire to slow an enemy's advance toward your fortress. Many trenches were equipped with machine gun posts, and in some cases underground caves.

Answer 4

they are formed when two oceanic plates collide.