Sentences with phrase «past volcanic activity»

Scientists use the volcanic ash found in ice cores to date the cores and to estimate the intensity of past volcanic activity.

(Interestingly, an American geologist living in that city has concluded that this hole, and another that formed there in 2007, are not technically sinkholes at all, but the result of stormwater drainage eroding the loosely packed pumice, laid down in past volcanic activity, that underlies the region.)

Beaches in this area are black sand due to past volcanic activity.

The new data are consistent with suspicions that the highland plateaus of Venus are ancient continents, once surrounded by ocean and produced by past volcanic activity.

What planetary scientists lump together as asteroids are far too diverse — from boulders to floating heaps of gravel to mini planets with signs of past volcanic activity and even liquid water — to have a single common origin.

In order to overcome the limitations of the dating method for the rocks covering the upper sedimentary layer, the research team led by Dr. Jin - Young Lee concurrently used radiocarbon dating and optically stimulated luminescence dating (OSL), using such cross-validation of which raised the accuracy of tracing the past volcanic activities.

Not exact matches

Currently, volcanic activity is exhibited only via numerous geothermal vents scattered throughout the region, including the famous Old Faithful Geyser, but within the past two million years, it has undergone three extremely large explosive eruptions, up to 2,500 times the size of the 1980 Mount St.

Now, research suggests that for the past decade, such stratospheric aerosols — injected into the atmosphere by either recent volcanic eruptions or human activities such as coal burning — are slowing down global warming.

But Bill McKinnon, a planetary scientist at Washington University in St. Louis, Mo., who was not involved in the study, pointed out that ultimately, Jupiter's moon Europa would be a more likely place for potential life to take hold: It's more massive and probably had some volcanic activity in the past.

The area is stable and no volcanic activity has been felt in the past 400 years thus making it a safe place to go.

The Tongariro National Park is host to a large area of past and present volcanic activity.

McGuire conducted a study that was published in the journal Nature in 1997 that looked at the connection between the change in the rate of sea level rise and volcanic activity in the Mediterranean for the past 80,000 years and found that when sea level rose quickly, more volcanic eruptions occurred, increasing by a whopping 300 percent.

A statistical model (based on the work of Judith Lean at the Naval Research Laboratory) that accounts for solar variability, El Niño, volcanic activity, and greenhouse warming indicates that the underlying trend of global warming has accelerated over the past 15 years.

Tuerqas, show me a study — any study — that shows Antarctic volcanic activity increasing over the past fifty years.

Data correlation and model simulations indicate that solar variability and volcanic activity are likely to be leading reasons for climate variations during the past millennium, before the start of the industrial era.

Volcanic activity proceeds over the decades at a level of only about 1 percent of industrial CO2 emissions, and even major eruptions observed during the past century have changed atmospheric CO2 trends only minimally and transiently.

IN THE PAST, volcanic activity has caused a bigger outflow of CO2 et al than human activity directly.

In doing so, the volcanic activity of the past was underwater at extremely high pounds per square inch.

For example very powerful volcanic activity in the past are numerous and well known, also we evidence of huge impactors which have hit earth.

10 Most past changes in world climates were caused by natural factors Volcanic activity Motion of the continents Recently scientists have observed climate changes that are the result of HUMAN ACTIVITIES GLOBAL WARMING

The MWP saw the lowest level of volcanic activity in the past 2000 years — from about 700 AD to about 1225 AD.

I have heard it said that periods of severe volcanic activity in the geological past increased global temperatures by emitting substantial volumes of greenhouse gases.

This rapid warming is consistent with the scientific understanding of how the climate should respond to a rapid increase in greenhouse gases like that which has occurred over the past century, and the warming is inconsistent with the scientific understanding of how the climate should respond to natural external factors such as variability in solar output and volcanic activity.

The climate has changed many times in the geologic past due to natural causes — including volcanic activity, changes in the sun's intensity, fluctuations in Earth's orbit, and other factors — but none of these can account for the current rise in global temperatures.

There is a solid body of research now showing that any apparent slow - down of warming during the past decade was likely due to natural short - term factors (like small changes in solar output and volcanic activity) and internal fluctuations related to e.g. the El Niño phenomenon.

I bothered enough to make a graph relating volcanic activity during the past 50,000 years.

Well, one possibility would be to analyze volcanic activity and 14C production data for the past 11700 years.

http://www.agci.org/docs/lean.pdf «Global (and regional) surface temperature fluctuations in the past 120 years reflect, as in the space era, a combination of solar, volcanic, ENSO, and anthropogenic influences, with relative contributions shown in Figure 6.22 The adopted solar brightness changes in this scenario are based on a solar surface flux transport model; although long - term changes are «50 % larger than the 11 - year irradiance cycle, they are significantly smaller than the original estimates based on variations in Sun - like stars and geomagnetic activity.

Some past changes in the climate were driven by the sun burning brighter, or by an increase in volcanic activity.

They pointed out the uncertainties in reconstructing past solar irradiance, and they dismissed volcanic activity as the cause of this warming.

Tectonic and volcanic activity was low in the Canterbury Basin over the past several million years20; the sediments are devoid of diagenesis, and evidence for gravity flows is rare22.