Sentences with phrase «over tens of thousands of years»

Unfortunately, the canine species has evolved over tens of thousands of years to require mostly fats and proteins.

In any case major change seemed impossible except over tens of thousands of years.

That's a rare bit of evidence of how much black - hole feeding can vary over tens of thousands of years.

Over tens of thousands of years humans have already demonstrated to be able to handle whatever consequences the change of climate may have.

In short, this is Live & Grow implemented over tens of thousands of years.

«There must have been regional climate and chemical conditions that varied in time and space,» he says, adding that this would occur as the tilt of Mars's spin axis changed over tens of thousands of years, a wobble caused by the lack of a massive moon to stabilise the planet.

«And someone should also talk to the astronomers: «The collapse to a white dwarf takes place over tens of thousands of years, (Wikipage on gravitational collapse)».

«It is just about possible that over tens of thousands of years Neanderthals thought up a way of doing one thing — making these tools — that humans hadn't thought of before,» says Coolidge.

But findings from deep drilling in the Songliao Basin show that the climate swings on land were far more drastic, with average annual temperatures going up or down by as much as 20 °C over tens of thousands of years — a geological eyeblink.

The rest of the package included a map that traced the migration of my haplogroup over tens of thousands of years.

But the sustained shrinkage of these horses over tens of thousands of years suggests a deeper genetic change that held fast over generations.

More than 7 billion people live on this planet — members of a single species that originated in one place and migrated all over Earth over tens of thousands of years.

These modern river sediments revealed rates of soil loss over tens of thousands of years.

Instead, the scientists believe, Madagascar was covered by a patchwork of forests, enabling the mouse lemurs to slowly disperse over tens of thousands of years between different areas.

The Bornean orang - utan is further subdivided into three distinct, geographically and reproductively isolated subspecies, which last shared a common ancestor in the Pleistocene and have differentiated substantially over tens of thousands of years.

The microbiota, which evolved over tens of thousands of years alongside their human hosts, constitutes a complex and diverse community whose exact composition varies from person to person.

Above the trail, canyon walls soar several thousand feet; waterfalls spill over them in long, glistening ribbons, carving natural amphitheatres over tens of thousands of years.

Glacial cycles (ice ages) are set in motion by (1) periodic wobbles in the tilt of the Earth's rotation, (2) changes in the tilt of its axis, and (3) the shape of its orbit occurring over tens of thousands of years.

Back then, the rise in temperature had apparently stretched over tens of thousands of years, «rapid» only to a geologist.

«Even for a total of 500 Gt C cumulative emissions, which is only slightly above the present - day value, the evolution of the Northern Hemisphere ice sheets is affected over tens of thousands of years (Fig. 4).

This shows the strength of the ice - albedo and carbon cycle feedbacks over tens of thousands of years...»

These attempted to determine how ice thicknesses, temperatures and gas - hydrate stability likely changed over tens of thousands of years.

And someone should also talk to the astronomers: «The collapse to a white dwarf takes place over tens of thousands of years, (Wikipage on gravitational collapse)».

It's now becoming clear, however, that human ancestors not only lived in the rainforest but transformed it over tens of thousands of years.

That instability could make it hard for animals to hang on over tens of thousands of years.

The researchers estimate that, over tens of thousands of years, the flows put out between 242 and 305 billion tons (219 and 277 billion metric tons) of sulfur dioxide.

The researchers estimate that, over tens of thousands of years, the floods put out between 242 and 305 billion tons of sulfur dioxide.

The study helped build a picture of what resources were available to Neanderthals over tens of thousands of years, and where they were traveling from.

Now, if you were to transform these to Keplerian elements, you would see that the heliocentric elements are almost constant: they change at most slowly, with secular changes over tens of thousands of years.

Without our use of fossil fuels, we should be descending into another glacial maximum — albeit slowly, over tens of thousands of years (the pace of natural global climate change in the Pleistocene).

They know that the highly regular ice ages are caused primarily not by CO2 increases and decreases in the atmosphere but by well known wobbles in the earth's rotation — over tens of thousands of years.

All these changes take place over tens of thousands of years, but they can change the amount of sunlight that the Earth gets in the Northern or Southern Hemisphere, and these changes in the distribution of the sun's heat are closely tied to the rise and fall of ice ages.

The earth spins on its axis on an ever changing wobble (over tens of thousands of years) back and forth, affecting the angle of sunlight striking the poles (by up to about eight degrees, I think) as the result.