Chapter 18 Mastering Geology

What size sediment can be transported by glaciers?

All sediments sizes can be transported by glaciers.

What is a possible cause for the transition from the last Ice Age to the current interglacial period?

Changes in Earth's orbit

What glacial landform is visible in Figure 1?

Drumlin

Which of the following is a characteristic of glacial till?

The particles are often scratched and polished.

What causes streams that emerge from glaciers to be milk-colored?

The presence of finely ground sediment called rock flour in the meltwater.

How did scientists realize that more than one Ice Age existed in the recent geologic past?

The presence of the remains of warm weather vegetation between layers of glacier till

What shape is a glacial trough?

U-shaped

What causes a crevasse to form?

When ice flows around a bend or over an obstacle, it is stretched and torn, causing large cracks to form.

What is the name for an isolated boulder of unexpected rock type that has been transported by a glacier and stranded after the ice melts?

erratic

In glaciated terrain, waterfalls are associated with ______.

hanging valleys

Most modern glaciers are __________.

retreating

What feature is responsible for creating eskers?

streams that flowed below, in, or on the glacier

Which landform marks the furthest extent of an advancing glacier?

terminal moraine