Sentences with phrase «earth history occurred»

The two most prominent warm phases in Earth history occurred during the Mesozoic and early Cenozoic eras (approximately 250 million to 35 million years ago) and the early and mid-Paleozoic (approximately 500 million to 350 million years ago).

Siberian Flood Basalts — MIT: About 252 million years ago, the largest mass extinction and the largest volcanic eruptions in Earth history occurred apparently synchronously.

Not exact matches

Well since Jesus left this earth some 2000 years have occured and history of that time can be read about (lots has happened).

So, if we know the number of speciation events that occurred over evolution's history, we could calculate the number of species that have lived on the earth.

Notice that life only occurred 1 time in earths history - IE biology show all life shares 1 common ancestor, but if life is naturally occurring shouldn't there be several different life forms that randomly came into existence and separate (not having any connections) from other life forms?

Her work contributed to fundamental changes that occurred during her lifetime in scientific thinking about prehistoric life and the history of the Earth, but, because she was a woman, she could not participate fully in the scientific community of 19th - century Britain.

Even though the actual rate of global warming far exceeds that of any previous episodes in the past 14,000 years, large changes in global climate have occurred periodically throughout Earth's history.

Floods have punctuated the Earth's history, but the «Zanclean megaflood» — so named for the geologic age during which it occurred (from 5.3 million to 3.6 million years ago)-- is thought to be the largest ever, the new research, published in January in Scientific Reports reveals.

Such is the harrowing testimony of one of the closest eyewitnesses to what scientists call the Tunguska event, the largest impact of a cosmic body to occur on the earth during modern human history.

The model showed that the second rise in atmospheric oxygen had to occur late in Earth's history.

One holds that the impact occurred early in Earth's history; another posits that two later collisions in sequence were responsible'or else a planetary body much larger than Mars must have been involved.

The new study, led by University of Bristol's Professor Philip Donoghue and Dr. Harald Schneider of the Natural History Museum, London, indicates that these events actually occurred a hundred million years earlier, changing perceptions of the evolution of the Earth's biosphere.

Then, students were asked to mark on the toilet paper when certain events in Earth's history, such as snowball earth, occuEarth's history, such as snowball earth, occuearth, occurred.

Mass extinctions occurred several times in Earth's history [117]--[118], often in conjunction with rapid climate change.

Aside from the origin of life itself, the transition from the anoxic Archean to the oxic Proterozoic is the most radical change to occur in the history of the Earth system.

Introduction; Changing Estimates of the Age of the Earth; Chronology of Writings; History of Radiometric Dating; References; Acknowledgements Chronology: Chronology, any method used to order time and to place events in the sequence in which they occurred.

Looking at the history of the evolution of living beings on Earth, six great extinctions have occurred in the past 600 million years.

A global warming phenomenon in our spaceship is one of several unintended effects of the unregulated, swift increase of 1) absolute global human population numbers, 2) per capita consumption of limited resources, and 3) large - scale business activities that could be occurring synergistically and approaching a point in history when it will not be possible for the Earth's resource base and frangible ecosystems services to sustain life as we now know it to be.

Just explain how anything in the past history of the Earth can compare to the changes that have occurred in the last century...

The Holy Grail of climatology has always been to ascertain whether, and if so how, the sun might affect the Earth's energy budget to cause the climate swings observed throughout history despite the apparent inadequacy of the tiny variations in Total Solar Irradiance (TSI) that occur from one series of solar cycles to another.

Much warmer times have also occurred in climate history — during most of the past 500 million years, Earth was probably completely free of ice sheets (geologists can tell from the marks ice leaves on rock), unlike today, when Greenland and Antarctica are ice - covered.

By Christopher Monckton of Brenchley About 18 months ago, as soon as I heard of Dr. Richard Müller's Berkeley Earth Temperature project, I sent an email to several skeptical scientists drawing their attention to his statement that he considered his team's attempt to verify how much «global warming» had occurred since 1750 to be one of the most important pieces of research ever to be conducted in the history of science.

If volcanos [or whatever] were emitting 1 trillion tons per year [something we probably should assume has never occurred in the history of earth] it then takes 5100 years this constant level of CO2 emission to make 1 atm of CO2.

The marine isotopic stage 11 (MIS 11) is an extraordinarily long interglacial period in the Earth's history that occurred some 400,000 years ago and lasted for about 30,000 years.

«Mass extinctions occurred several times in Earth's history, often in conjunction with rapid climate change.

There is no way to calculate the odds of some such combination occurring, but for it to have occurred once in the four billion year history of Earth is not unbelievable.

The current rate of environmental change is much faster than most climate changes in the Earth's history, so predictions from longer term geological records may not be applicable if the changes occur within a few generations of a species.

Mass extinctions occurred several times in Earth's history [117]--[118], often in conjunction with rapid climate change.

We also include in the category of slow feedbacks the global warming spikes, or «hyperthermals», that have occurred a number of times in Earth's history during the course of slower global warming trends.

There just isn't the ability to hold anyone accountable for this; in the future, history may cite the reasons why things occurred in the past, but are there names like Stalin, Hitler, Mussolini, Tojo that could be held accountable for the failure of Earths decision - makers to avert environmental disaster?

We now have clear evidence of the crisis, provided by increasingly detailed information about how Earth responded to perturbing forces during its history (very sensitively, with some lag caused by the inertia of massive oceans) and by observations of changes that are beginning to occur around the globe in response to ongoing climate change.

Real - world complexity, including ocean dynamics, can mute this sharp bifurcation to a temporarily stable state [101], but snowball events have occurred several times in the Earth's history when the younger Sun was dimmer than today [102].

Perhaps you could address what I consider to be most crucually wrong with your claims: — Such a low sensitivity (0.5 deg) is incompatible with measurements — With such a low sensitivity you can not explain the large climate changes that have occurred in Earth» history, e.g. the ice ages.

But Milankovitch wasn't just interested in tracking changes in sunlight with his model — he wanted to explain why ice ages occurred, why at various times in the history of the Earth glaciers were formed and later melted away.

Such rates of sea level change have occurred many times in Earth's history in response to global warming rates no higher than those of the past 30 years.

Past episodes in the earth's history, especially one that occurred about 55 million years ago, featured drastic warming accompanied by sea - level rise and other events that would be calamitous for today's civilization.