时间:2019-01-22 作者:英语课 分类:自然百科2011年


英语课
By analyzing 1 different samples of lava 2, Herrero / Bervera  has built up a picture of how the filed has changed since long before humans were around.
 
 
 
They are actually the recorders of the Earth's magnetic field in hundreds of years, thousands of years, and this is what we need actually to know something about the Earth's magnetic filed. 
 
 
 
 
 
Lower layers of rock take Herrero Bervera progressively further back in time. 
 
 
 
To unlock the information, he takes a sample of the ancient lava, as well / he is showing how the field strength has changed, the sample will also reveal another vital piece of information. He carefully notes the sample's exact location.
 
 
 
And we would, we're going to measure it, demand the decision of the sample we collected in the field. 
 
 
 
Back at the lab, he analyses it using a magnetometer like a pottery 3, lava contains / magnetite. When it cools, particles of magnetite lining 4 up with the Earth's magnetic field like tiny compass needles, recording 5 both its strength and its direction. In this sample, the magnetite lines with today's magnetic north. 
 
 
 
This sample wasn't placed in the past 700,000 years when the field was actually gluttonized by a normal polarity . 
 
 
 
But in old samples, they discover something incredible. The magnetic particles point South rather than North. They date back to a time when the magnetic field polarity was the opposite of today's.
 
 
 
There was a reversal actually recorded by these lava floors. I will be actually / able to see a sequence of points that are actually defining the behavior or the evolution of the magnetic field from the one polarity to the other polarity.

v.分析;分析( analyze的现在分词 );分解;解释;对…进行心理分析n.分析
  • Analyzing the date of some socialist countries presents even greater problem s. 分析某些社会主义国家的统计数据,暴露出的问题甚至更大。 来自辞典例句
  • He undoubtedly was not far off the mark in analyzing its predictions. 当然,他对其预测所作的分析倒也八九不离十。 来自辞典例句
n.熔岩,火山岩
  • The lava flowed down the sides of the volcano.熔岩沿火山坡面涌流而下。
  • His anger spilled out like lava.他的愤怒像火山爆发似的迸发出来。
n.陶器,陶器场
  • My sister likes to learn art pottery in her spare time.我妹妹喜欢在空余时间学习陶艺。
  • The pottery was left to bake in the hot sun.陶器放在外面让炎热的太阳烘晒焙干。
n.衬里,衬料
  • The lining of my coat is torn.我的外套衬里破了。
  • Moss makes an attractive lining to wire baskets.用苔藓垫在铁丝篮里很漂亮。
n.录音,记录
  • How long will the recording of the song take?录下这首歌得花多少时间?
  • I want to play you a recording of the rehearsal.我想给你放一下彩排的录像。
学英语单词
absorption wave-trap
adsubble method
aldazines
ambulancepersons
Angamma, Falaise d'
anionite
AR (acceptance requirement)
Argeliers
argon instability
atomlloy treatment
babyfaced
bertholds
black oil
boogeyman, boogerman
borolls
branch account
Braveheart
bulk update
Bunker Grp.
C battery port
center samplerecovery
check valve body
CONTD(continued)
crosswater
deafening device
doublecircuit
electrically transmittingsynapse
electro-chemical corrosion
electromagnetic viscometer
Emmelsbüll-Horsbüll
engineering university
Equity Unit Investment Trust
filling oil cover
fling down the glove
frequency changer-over switch
fumaroles
going bananas
gugion
have a corner in someone's heart
heavy mortar
hunter greens
IBIOL
iconographically
imposteme
inclusive nor circuit
ionic switch
irradiant
Ixodiphagus caucurtei
kelvin contraction
long-head coneflower
longitudinal thrustfault
molding time
nadell
nicalloy
nikoles
Nortbruk, Ostrov
nulling coefficient
o'beirne
off from work
open vascular system
parallelosteric
perennial crop
Pipili
polagizing angle
porphyry tin deposit
pre-acquisitions
printing machine
pseudism
pseudo-random impulse response technique
Punjab Himalayas
recovery efficiency
RENAP
respiratory pathology
risk preferring
salks
Schizopepon dioicus
secret mitre
Serpentine Lakes
short haul road service
sober down
soft price
stereophonic reproduction
string bark
Stötten am Auerberg
Sulzberger-Chase phenomenon
superaqueous landscape
surface evaporative condenser
surmisant
tanella vermicularia
text for test
the Alps
thermal neutrality
trathala matsumuraeana
ultra-high reduction
unspelling
vena labialis
verification system
verify unit
warship
weekly bulletin
young sow which has not been bred