Exam 13: Glaciers and Ice Ages

Snow can form into rounded ice grains, called firn, if ____.

Rocks embedded in the base of a glacier scrape across underlying bedrock, gouging parallel grooves and scratches are called ____.

A ____ is an elongate hill of sediment, usually occurring in clusters, that was deposited and eroded by a glacier.

Cycles identified by Milutin Milanković are caused by ____.

The Great Salt Lake is a remnant of the once-larger ____ lake called Lake Bonneville.

A glacier that covers an area of 50,000 square kilometers or more and spreads outward in all directions under its weight is a(n) ____________________.

A moraine that forms when a glacier is at its greatest advance is a ____.

Glacial striations can be used to map the flow direction of glaciers.

A ____ moraine forms when a glacier retreats steadily, depositing till in a relatively thin layer over a broad area.

Describe the growth of an alpine glacier.

Describe the rate of glacial movement, include the factors that influence the rate.

____ is sediment that was first transported by a glacier and then transported and deposited by a stream.

The ____ is the boundary between the zone of accumulation and the zone of ablation.

What are horns and where are the most famous ones located?

During the maximum extent of Pleistocene glaciers around 18,000 years ago, global sea level was about ____ than present levels.

Describe the two categories of drift.

A broad, gently-sloping surface that forms when outwash spreads onto a wide valley beyond a glacier is a(n) ____________________.

A small glacial valley lying high above the floor of the main valley is called a(n) ____________________.

Alpine glaciers are found on every continent on Earth.

Glaciers move by ____________________ when an entire ice mass slides over bedrock.