Arêtes
The place where two faces (planes) intersect is called an edge.
the point where the altitudes intersect is called the orthocenter.
Two lines cross or intersect at a point.
A vertex.
Cirques intersect at their highest point, where the walls of adjacent cirques meet to form a sharp ridge or crest called an arête. This intersection often occurs at a mountain peak or ridge line.
TRIANGLESthey are cirques
Cirque: A bowl-shaped depression on the side of a mountain, formed by the erosive activity of a glacier. Cirques are typically characterized by steep walls and may contain a small lake called a tarn at their base.
Cirques
Steep-sided, half-bowl shaped recesses carved into mountains at the heads of glacial valleys. The Fjords: Steep cliffs, acting as ocean inlets. Horn peaks: Where cirques intersect. Terminal moraines: Piles of rocks. Crevasses: Cracks in glaciers
Glaciers grind into mountains by eroding the cirques at their heads. If a mountain has cirques all around it, it is called a horn
Arêtes
True. Glaciers erode the base of mountains into basins called cirques through a process known as glacial erosion. This results in the formation of amphitheater-like depressions at the base of mountains.
Coplanar lines that do not intersect are called parallel lines.
Lines that never intersect are parallel.
Coplanar lines that do not intersect are parallel. Non-coplanar lines that do not intersect are called skew lines.
Fjords: Steep ocean inlets Drumlins: Smooth hills Cirques: Armchair-shaped valleys Moraines: Piles of rocks :D