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  • Irish Chronicles Document Links Between Volcanoes and Weather
    A study of over 40,000 written entries in Irish Annals and ice core measurements shows a strong corr...Read more

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    Irish Chronicles Document Links Between Volcanoes and Weather

    A study of over 40,000 written entries in Irish Annals and ice core measurements shows a strong correlation between the occurrence of volcanic eruptions and extreme cold weather in Ireland over a 1200 year period. Data analyzed in this study cover the period from 431 to 1649, during which time up to 48 volcanic eruptions are identified in Greenland ice core records through deposition of volcanic sulfate in annual layers of ice. You can find the study (open access), published on 6 June 2013 in IOP Publishing's journal Environmental Research Letters, at http://iopscience.iop.org/1748-9326/8/2/024035/article. Find out more about how volcanoes can influence climate.
  • EF-5 Tornado in El Reno, Oklahoma Widest Ever Recorded in US
    The EF-5 tornado that hit El Reno, Oklahoma on May 31st was the widest ever recorded in the US, acco...Read more

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    EF-5 Tornado in El Reno, Oklahoma Widest Ever Recorded in US

    The EF-5 tornado that hit El Reno, Oklahoma on May 31st was the widest ever recorded in the US, according to the National Weather Service in Norman Oklahoma. The tornado, which remained on the ground for 40 minutes and reached 2.6 miles across (4.2 km), took the lives of 18 people including storm chasers Tim Samaras, Paul Samaras and Carl Young. For more information on the tornado, visit http://ow.ly/i/2hfDG.
  • Atmospheric CO2 Level Tops 400 ppm
    During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm rep...Read more

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    Atmospheric CO2 Level Tops 400 ppm

    During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm repeatedly. Daily levels of CO2 can vary due to weather, and there are seasonal trends as well. The level of atmospheric greenhouse gases continues to increase, now over 120 ppm since the Industrial Revolution began. For more on the Keeling Curve, see http://keelingcurve.ucsd.edu/. Find out more about greenhouse gases and warming.
This image shows Rocks explored by the Rover.
Click on image for full size
Image from: JPL/NASA

Rocks explored by the Rover

This diagram shows the path traveled by the Mars Pathfinder Rover during its 80 day mission. In addition to sampling the atmosphere, and the Martian soil, during it's travels on the Martian surface, the Rover took measurements at a number of different rocks. Measurements helped scientists classify the rocks.

These rocks were scattered all around the Pathfinder landing site. The Rover visited many rocks. Scientists gave them names like: Pop Tart, Ender, mini-Matterhorn, Wedge, Baker's Bench, Flat Top, and the Broken Wall. We will not show you all the rocks visited by the Rover, but will discuss a representative sample. Rocks not in this list can be viewed in the Mars Pathfinder Image Archive below.


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Traveling Nitrogen Classroom Activity Kit

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Soils explored by the Rover

One of the objectives of the Mars Pathfinder mission was the examination of the composition of the soil and how it was laid down. As the Rover traversed the surface exploring the rocks of Mars, it also...more

Classes of Martian Rock

Even though the rocks seem to be much the same, scientists can see three basic differences in these rocks. These differences help them figure out more about weathering processes on Mars and where the soils...more

Pooh Bear

This image shows the rock called Pooh Bear. Soil found near Pooh Bear seemed to be a clumpy kind; finely grained, cloddy, and rocky. This was different from the soils found near the rock Scooby Doo, which...more

Mars Global Surveyor Measures Pyroxene

Mars Global Surveyor made a measurement of pyroxene on the surface of Mars. Scientists looking at results from the Mars Pathfinder Rover's study of the rocks of Mars could not find evidence of pyroxene...more

An Overview of the Mars Pathfinder Mission

The goal of the Mars Pathfinder (MPF) mission was to analyze the rocks and soil of Mars. The MPF was actually 2 parts, a lander and a rover. The lander stayed right where it landed while the rover named...more

Headlines declare: Mars Pathfinder Lands on July 4th

The Mars Pathfinder was launched in December 1996 on a Delta II rocket. The spacecraft entered the atmosphere on July 4th, 1997, where a heat shield, parachutes, and airbags helped it land. After impact...more

Results from Mars Pathfinder

These are the findings of Mars Pathfinder. Rounded Pebbles, Cobbles and possible Conglomerates were found - a result from analysis of the landing site, the rocks, and the soils. showed that there were...more

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