As interplanetary dust is thought to have rained down on early Earth, it is likely that the stuff brought water to our planet, although it is difficult to conceive how it could account for the millions of cubic kilometres of water that
cover Earth today.
Not exact matches
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In a study published
today in the journal Nature, University of Pennsylvania anthropologist Clark L. Erickson < reports that a network of low, zigzag structures of raised
earth and ponds
covering hundreds of square kilometers in Baures represents a pre-Columbian fishery.
The sediment cores used in this study
cover a period when the planet went through many climate cycles driven by variations in
Earth's orbit, from extreme glacial periods such as the Last Glacial Maximum about 20,000 years ago, when massive ice sheets
covered the northern parts of Europe and North America, to relatively warm interglacial periods with climates more like
today's.
Today,
Earth is completely
covered by giant tectonic plates of continental and oceanic crust.
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If, like any other sane person on this
earth, you woke up
today with a lingering need to watch a montage of fast sports cars speeding through race tracks set to an intense piece of classical music, then look no further, as Slightly Mad Studios have you
covered with this latest trailer for their upcoming driving sim Project CARS.
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.
The two ice sheets on
Earth today cover most of Greenland and Antarctica.
For example, if the
Earth were magically ice -
covered today, this would be a completely stable situation and there would be no tendency to escape that state unless the greenhouse effect was substantially enhanced or the sun got brighter.
The new study explores what happened to ocean circulation when the
Earth went through a series of abrupt climate changes in the past, during a time when ice
covered part of North America and temperatures were colder than
today.
This quantity was calculated for
today's
earth with the best estimates of temperature and composition profiles for various regions on the planet (soundings), cloud
cover, cloud top elevation, etc..
We are warmer know tan in many thousands of years, and when the
Earth was slightly warmer than it is
today substantial portions of both coasts were
covered by water.
«It simply impossible to have the entire surface of the
earth covered with ice with solar radiation at
today's levels, even starting with an iceball with no CO2.
Today Earth is a pretty temperate place, but about 700 million years ago ice
covered the planet from pole to pole, in an extreme glaciation period often called «Snowball
Earth.»
Given current emissions trajectories, there is a chance that the temperature increase by 2100 could be near 6oC.21 The last time
Earth exhibited a global mean temperature that high, what are now sagebrush grasslands in the southwestern Wyoming and Utah were
covered by subtropical, closed canopy forests interspersed with open woodlands (Townsend et al., 2010), reminiscent of subtropical areas in Central America
today.
Today, Conde Nast's Porfolio
covers this «
earth shattering» story about stressed - out, overworked, guilt - plagued, miserable lawyers who don't lead balanced lives.