How many ice ages have there been in the last 750000 years?

Answer 1

There have been at least five major ice ages in the Earth's past.

1. The Huronian, formed around 2.4 to 2.1 Ga (billion years) ago during the early Proterozoic Eon.
2. The Cryogenian ice age, probably the most severe of the last billion years, occurred from 850 to 630 million years ago
3. The Andean-Saharan minor ice age, 460 to 420 million years ago, during the Late Ordovician and the Silurian period.
4. The evolution of land plants caused a long term reduction of CO2 levels, which resulted in the Karoo Ice Age, 360 to 260 million years ago.
5. The current ice age, the Pliocene-Quaternary glaciation, started about 2.58 million years ago during the late Pliocene. It is called current because the glaciers in Greenland and Antarctica and other places still remain from that age.

Answer 2

At least 4 that we are aware of, not including the mini ones. One would have to further define "extent" to pin this down exactly. Personally, I consider the selection of movies in 2007 a bit of an ice age. I mean - what WERE they thinking? They should have canceled the Oscars and apologized. Even the pirates refused to make copies of that trash. But I digress...

Earth was originally a big snowball, like totally covered with ice, and without going into metaphors involving my sex life, lets just say global warming got the whole thing going. Yup, volcano's spewing out carbon dioxide got the whole ball-a-melting. There have been 3 others since then, but of course the most recent is the one we know the most about. About 20000 years ago it got cold. Really cold. Sheets of ice and all that fun that comes with them shoved southward and carved up the land with its mass, creating new rivers, lakes, hills and generally making things a bit iffy for the animal life which had to push southward. (wouldn't you?). Mini ice ages also occur now and then, and basically, the climate shifts for a dozen years or so and makes it hard to get people to the beach. Some scientists speculate that the low solar activity we have been experiencing recently might be an indication of a future mini ice age, but global warming may have put a stop to it. Personally, I am just waiting for my stock to go back up so I can retire to Florida.

Answer 3

There have been at least 5 ice ages (more accurately glacial ages) in earth's past. Outside of these ice ages the earth has been ice-free even in higher latitudes (eg. near Arctic)

The most severe ice age occurred during the Cryogenian period and produced a Snowball Earth where glacial sheets even reached the equator.

A minor ice age called Andean-Saharan occurred during the Late Ordovicianand Silurian Period.

Answer 4

There have been five major ice ages in Earth's history: the Huronian, Cryogenian, Andean-Saharan, Karoo Ice Age and the Quaternary glaciation. There have been many "little ice ages" in various parts of the world, however, where the climate was unusually cold for several years at a time.

Answer 5

There have been around 8-10 ice ages in the last 750,000 years. These ice ages are characterized by periods of extensive glaciation followed by warmer interglacial periods.

Answer 6

In the last 750 thousand years, there have been 2 ice ages. In fact, scientists believe we are currently living in an ice age.

Answer 7

We are currently in an ice-age, but in an interglacial period. There have been at least four glacial episodes in the last million years, the last one ending around 12,000 years ago.

Answer 8

There have been many ice ages over the past 4.6 billion years. During the past 1,000 million years there have been at least 20 known such events and probably many more not known.

Answer 9

3 or 4

more like 7 that we know of

Answer 10

Their were about 11 different Ice Ages?