A geologist is looking at deposits along a river below a large volcano. She finds large boulders mixed with sand and mud, and al
l of the material is comprised of volcanic rocks, particularly the mud which is volcanic ash. She quickly realizes these deposits represent an ancient ________.
An ancient lahar is the likely kind of <u><em>volcanic deposit </em></u>discovered by the geologist here considering that an ancient lahar is a mudflow on the flanks of a volcano. It usually consists of;
Astronomers use redshirts to track the rotation of our galaxies, tease out the subtle tug of a distant plant on its parent star, and measure the expansion rate of universe.
