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How many glacial periods have there been for the last two million years?
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How long has global warming effected the earth?
Approximately 4 billion years, give or take a few million years. Since the beginning, the earth has gone through continuous warming and cooling periods. For instance, about 200 million years ago dinsoaurs were roaming around the jungles of Colorado. Global cooling might have been their downfall. More recently, glaciers covered most of Wisconsin about 700,000 years or so ago. Since then there have been as many as 10-12 glacial advances and retreats. The most recent major glacial advance peaked out about 20,000 years ago, then global warming set in and glaciers retreated for about 10,000 years after which there was a slight glacial advance. The earth warmed again and peaked around 5,000 years ago. The warming period since the last major glacial advance was when man started developing agriculture, and have more time to invent stuff. About 2000 years ago there was a minor glacial advance in some areas, then warming. About 500-600 years ago the "little ice age" began with cooling temps that lasted to the mid 1800's. Since then it has been warming except for a cool down from about 1940-1970 when some scientists thought we were going into another "ice age". Since the mid 70's things have been warming rapidly. This warming has been a great opportunity for some folks to blame all global warming on human activities. So far I don't think anyone really knows for sure, but whatever the cause, it could have profound effects on all life on earth, just as it always has.
How long has Earth been in it's current era?
65 Million years
How long have stingrays been on the Earth?
For about 300 million years.
What is the time span of the ice age?
Depends on the Ice Age in question as there has been a few in Earth's history. The most well-documented ice age, and probably the most severe of the last billion years, occurred from 850 to 630 million years ago (the Cryogenian period) and may have produced a Snowball Earth in which glacial ice sheets reached the equator.
Is glacial ice different from regular ice?
Yes. Glacial ice is ice that has been compressed under great pressure and will react differently as it melts.
How many glacial periods have there been during the last two million years?
There have been multiple glacial periods, known as ice ages, during the last two million years. These ice ages are characterized by intervals of cold climate when ice sheets covered much of the Earth's surface. The exact number of glacial periods can vary depending on the scientific definition used.
Why do scientist think that in 20000 years ther will be another ice age?
They think there may be another glaciation. We are living in a warm period, (an interglacial), IN an ice age which started 2.6 million years ago. There have been many glacial and interglacial periods during that time. It is called Climate Change and it happens all the time, but we don't live long enough to see it happening.
How often do earth magnetic poles reverse?
Time periods between Earth's magnetic pole reversals are varied. There are geologic periods where multiple reversals have occurred and periods of no activity. In the last 3.6 million years, there have been at least nine reversals, the last occurring 730,000 years ago.
Has there been a ice age?
Strictly speaking, we are in an ice age now. It started about 2.6 million years ago and is composed of cold periods named "glaciations" and warmer periods named "interglacials" which is where we are now. The last glaciation ended about 10,000 years ago.
Dragonflies gestation period?
Dragonflies have been around for about 300 million years. They can have varying gestation periods, some can be five days, some can be seven months.
What evidence of glaciers tell us about Pangea?
the evidence isfossil evidence - identical fossils in different continentrock type and structural similarities - found similar rocks on continents on opposite sidesstudy of climate - the heat of the sunfrom a book thanks
Are glaciers dissapearing?
No, there are still glaciers in California, Washington, Montana, Colorado...pretty much everywhere they have been, just a bit smaller. A disproportionate amount of sea level rise in recent decades has been due to the melt of such glaciers (i.e. midlatitude alpine glaciers) rather than the more media-friendly polar ice sheets.
What do geologist call the second era?
The second geologic era is the Mesozoic Age. This would have been 248 million to 65 million years ago. Mesozoic means "middle life". This time would have been when dinosaurs roamed the earth during the Cretaceous period. Periods during this era included both the Jurrassic as well as the Triassic periods.
How long has a cockroach been around?
according to some writers, they've been here for about 400M years.
How long has global warming effected the earth?
Approximately 4 billion years, give or take a few million years. Since the beginning, the earth has gone through continuous warming and cooling periods. For instance, about 200 million years ago dinsoaurs were roaming around the jungles of Colorado. Global cooling might have been their downfall. More recently, glaciers covered most of Wisconsin about 700,000 years or so ago. Since then there have been as many as 10-12 glacial advances and retreats. The most recent major glacial advance peaked out about 20,000 years ago, then global warming set in and glaciers retreated for about 10,000 years after which there was a slight glacial advance. The earth warmed again and peaked around 5,000 years ago. The warming period since the last major glacial advance was when man started developing agriculture, and have more time to invent stuff. About 2000 years ago there was a minor glacial advance in some areas, then warming. About 500-600 years ago the "little ice age" began with cooling temps that lasted to the mid 1800's. Since then it has been warming except for a cool down from about 1940-1970 when some scientists thought we were going into another "ice age". Since the mid 70's things have been warming rapidly. This warming has been a great opportunity for some folks to blame all global warming on human activities. So far I don't think anyone really knows for sure, but whatever the cause, it could have profound effects on all life on earth, just as it always has.
How long have turtles been on Earth?
How long have turtles been on the Earth? They have been around for 300 million years.
How long have ginkgo trees been around?
trees have been aroun for 49 million years
