文章列表

• 1.英语听力：自然百科 地球力场 Earth's Force Field—10
• Larry Newitt from the Geological Survey of Canada charts the movement of the magnetic North Pole as it wanders the icy reaches of northern Canada. To ...
• 2.英语听力：自然百科 地球力场 Earth's Force Field—9
• As the vast sphere reaches / maximum speed, something incredible happens. Huge lines of magnetism arc in and out of the model core. Well, we can't see...
• 3.英语听力：自然百科 地球力场 Earth's Force Field—8
• Easily confused by this idea, there has a big thawed iron inner core, so that I think it's just the bar magnet, just permanent magnet frozen in nad, a...
• 4.英语听力：自然百科 地球力场 Earth's Force Field—7
• The loss of the magnetic field has a catastrophic impact on the planet's evolution. Mars becomes the red planet we see today. If earths magnetic prote...
• 5.英语听力：自然百科 地球力场 Earth's Force Field—6
• It's clear from the fact that the Martian crust is strongly magnetized, that there must have been a magnetic field on Mars in the past, that the only ...
• 6.英语听力：自然百科 地球力场 Earth's Force Field—5
• If we could flip a switch and just turn off the Earth's magnetic field, it will take about 15,000 years to disappear, based on the rate of decay of th...
• 7.英语听力：自然百科 地球力场 Earth's Force Field—4
• Scientists believe that the South Atlantic Anomaly, is a sign of a global decline in the magnetic field. Evidence of this comes from a surprising sour...
• 8.英语听力：自然百科 地球力场 Earth's Force Field—3
• In polar regions where the magnetic field is / weakest, auroras glow in the sky. These dazzling displays of colored lights form when solar particles s...
• 9.英语听力：自然百科 地球力场 Earth's Force Field—2
• Radiation causes damage at the most fundamental level. It mutates the blueprint of life, DNA. Earth's magnetosphere is our crucial defense. It's so fu...
• 10.英语听力：自然百科 地球力场 Earth's Force Field—1
• The solar system is a hostile place. Earth is under attack from deadly cosmic radiation. Life here is only possible, because it's protected by the mag...