(C)Scientists know that the internal forces that generate Earth's magnetic field(磁场) can change and that the strength of the field swings over time. This can lead to gradual shifts in the intensity and location of Earth's magnetic north and south poles and even reversals where Earth's ma...
This is called magnetic field reversal. 这叫做磁场反转。 reversal 英[rɪˈvɜːsl] 美[rɪˈvɜːrsl] n.倒转;逆转;反转;颠倒;彻底转变;倒置;倒退;退步;转胜为败;(位置或功能的)转换,交换 Every 200,000 to 300,000 years, the Earth's magnetic field reverses. 每过20万到30万年,...
Figure 7. The magnetic field of the Earth is due to convection in the outer core, for which the configuration is not determined (reproduced from D Ravat (2000) Magnetic field, origin of the Earth's internal field. In: Hancock PL and Skinner BJ (eds.) Oxford Companion to the Earth, pp...
The geodynamo model for the origin of the earth's field is lent further credence by the fact that the moon which turns around its own axis very slowly once in 28 days has a negligible magnetic field. Also, Jupiter which spins much faster than the earth has a very strong ma...
Learning practice - use what you know to answer questions about the area where magnetic fields come together and the reason there's a magnetic field around Earth Remembering details - remember what you've learned about the scientist who developed a law of attraction and repulsion Additional Lea...
【选择】-If the earth's outer layer rotate around the liquid metal outer core? -It would cause the continents to shift positions. 【选择】-How likely is it that a field reversal would be an extinction event? -It's highly unlikely. ...
Professor: Okay, keep in mind that solar wind is electrically charged, which means that it interacts with the magnetic field as electromagnetic theory tells us.Okay, how does it interact?Earth, magnetic field deflects most the solar wind, makes it flow around the earth without getting very clo...
Earth's magnetic field originates in the outer core and extends out into the magnetosphere — a region of space that helps protect Earth from space weather.
What is Earth's Magnetic Field? Imagine a bubble that surrounds Earth. Earth's magnetic field acts like an invisible shield around Earth that protects it from dangerous things, like radiation from the sun. You might say it's Earth's super power. It's also called amagnetosphere, the most ...
What is the area around a magnet called where magnetic forces are felt? A. Electric field B. Magnetic field C. Gravitational field D. Radiation field Correct Answer B. Magnetic field Explanation Magnetic field is the area around a magnet. The magnetic field is the region around a magnet wher...