Earth's Motions
The change in shape of the Earth's orbit:
eccentricity
The primary long-term cause of ice ages:
orbit, revolution around the sun
Valley glacier is also known as an __________ glacier.
Alpine
One "precession" takes how many years?
26,000
The last glaciers left Ohio approximately how long ago? (at the end of the Wisconsin Ice Age)
12,000 years
another name to describe Earth's tilt:
Obliquity
Most recent ice age to affect Ohio:
Wisconsin
This landform marks the endpoint of how far a glacier advanced:
terminal moraine
Length of time for Earth's obliquity (axial tilt) to complete one full cycle:
41,000 years
Ohio's river drainage, before glaciation, flowed in which direction?
north, northward
What is the meaning of "precession"?
wobble
A measure of a planet's (or other objects) reflectivity:
albedo
A large collection of rocks, sand, gravel and other sediments deposited by a retreating glacier.
Glacial till
What country was Milankovitch from?
Serbia
The Wisconsin Glaciation, which greatly influenced Ohio's landscape, began approximately how many years ago? (it ended 12,000 years ago)
75,000
Earth's eccentricity makes a complete cycle (approximately) every _______ years.
100,000
What is the current measure of Earth's eccentricity?
0.017
Small body of water formed as "chunks" of a glacier fell off, impacted into the ground and melted.
Kettle Lake
Eccentricity is measured between 0 and ______.
one, 1
What Ice Age, in Ohio, occurred before the Wisconsin Ice Age?
Illinoian Glaciation,
Earth's axial tilt varies between _____* and 24.5*.
21.5
How long ago did "Snowball Earth" occur?
700 million years
Bowl shaped depression caused by an alpine glacier's erosion techniques
Cirque
The amount of solar radiation that reaches the ____ hemisphere is key to predicting ice ages.
northern
Laurentide