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
-ino
abietates
acoustic birefringence
acoustic bridge
all metal brake lining
automatic balance type
ball-and-stick
be duty - bound to
buttstrap joint
cap log
casing test pressure
chloroplast ribosome
clodinafop-propargyl
computer assisted training system
controlled blasting
coodley
deblur
deep-sea fishing
deflecting cavity
delivery method
diafocal point
doctorates
dokles
dwindlings
Eldingen
emergency diesel station
esaflxacin
escalatory
eurypharynx pelecanoides
flat commission
Folgaria
formal defect
formalises
Gelbin
grated cheese
haeremai
index prism
intensive technologies
isophenological line
Itterbeck
laser ceramic
liver wind
magnesiofoitite
Marconi self-tuning system
mass transfer control
mcgeorge
mesoxalylcarbamide
Minor Arcana
mochan
modulator band electrical system out
mono-stearin
neuro-psychologists
nitokra pietschmanni
Norrent-Fontes
not care for
on the river
open arbitration
organo-tin compounds
porchless
praedium dominans
Preset System
pressurized reservoir
process identification
Propagating Zero-sided Lindemayer system
pseudo-energy-tensor
pushed away
re-engender
red-white compound jewel
running speed
Sanggar
scobby
scsi configuration automatically
second-segment climb
seedbed
self-baking
severinsen
shock capturing al gorithm
Sirājpur
smack-head
specific source
sprial heat exchanger
step-and-repeat negative machine
strain gauge transducer
subclimax
subvent
sverres
syncopecollapse
telegraph editor
thoracic duct
tideplant
tinto-meter
tuohey
Twx, teletypewriter exchange service.
ultra-sonic frequency
underdrawing
universal milling and boring machines
upper bound
variable direction
vena anteriores cerebri
voine
voltage endurance test
zygomaticotemporalis