时间:2019-02-24 作者:英语课 分类:英语听力文摘 English Digest


英语课

  It's a common enough sound in summer, after the wind finally picks up on a hot and humid afternoon, as the rain starts spattering down in big, fat drops--you're in for a full-blown thunderstorm.

It's much less common in winter, even during a snow storm. Why is thunder so much more likely in summer than in winter? We'll learn about thunder snow, on today's Moment of Science.

In a summer thunder storm, the atmosphere is stacked up like a two-layer cake. The lower layer is full of warm, moist air; the upper layer is icy cold and dry. Because hot air rises, there are soon tremendous updrafts, carrying the warm moisture of the lower layer up into the cold, dry layer. The turbulence 1 of these updrafts creates static electricity as the air masses rub against each other. Thunder and lightning occur when the static electricity discharges in a giant bolt of electricity.

In the winter, the layer of air near the ground is likely to be a lot colder and drier than it is in the summer. It's much harder to get the sharp divisions in the atmosphere that lead to turbulence, static electricity, and thunder. It can happen though, especially near the coast. A thunderstorm can form over the relatively 2 warm and moist air over the ocean, then move into the icy atmosphere over the land. When this happens, you'll get a sharp atmospheric 3 division in a snow storm, and you'll get a thunder snow.



n.喧嚣,狂暴,骚乱,湍流
  • The turbulence caused the plane to turn over.空气的激流导致飞机翻转。
  • The world advances amidst turbulence.世界在动荡中前进。
adv.比较...地,相对地
  • The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
  • The operation was relatively painless.手术相对来说不痛。
adj.大气的,空气的;大气层的;大气所引起的
  • Sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面温度与大气环流是密切相关的。
  • Clouds return radiant energy to the surface primarily via the atmospheric window.云主要通过大气窗区向地表辐射能量。
学英语单词
Android WebView
attitude survey
baquerizoes
benevolent fund
Benzone
Borisoglebskiy
bornless
Bowen's diseas
categorist
CENTRINEDimevamide
charge-transfers
choker-setter
CIDST
cloud base height
CMVIG
co-surety
combined steam and gas turbine machinery
compactness of a work-load model
complex swamping
cutoff date
cutter tooth number
diglycollic anhydride
dolittle
Echinochloa cruspavonis
ecological geography
electronic data-processing (edp)
euphorbia exiguas
extended data output
featherdom
fibre ribbon connector
fibroblasts
fixation mark
fluoric ether
free-well agreement
Gad's hypothesis
gametogenic
gasmasks
geological high
Grenadines (Grenadine Is.)
Hoybergodden
IL-12
inter-mask
iron sleeper
irrespectful
isoasparagine
jack connection
JM-9
kemelin
lendabler
litispendence
logarithmically periodic dipole
Machilus leptophylla
maximum to average power ratio
mechanical lock
mesially
mit lisp machine
mounted cultivator
mundisal
mycteric
nice to have
norie
oligosiderites
onsatisfeit
Oporto(Porto)
Orcheobius
Pardies
Pastinaca sativa
plane wave
premium-rate telephone number
protecting wall
protoconus
pseudolooper
pulse xenon lamp
pundulum
rappeneaux
rehberger
research on sales policy
route handle
Rubbra
Rudolf Hess
SAMOS program
sea voyage
section plane
settle up on a plan
shell-mound
Shāhdād
sodium metastannate
space-born metric camera
spiral fluted
strengthening-plaster
sultiame
Tadoba National Park
tank collapsing
theory reductionism
to have the lee ga u -ge of
tongued
tsarevnas
turn the key to a lock
turnbuckle screw
unfrankly
white turnip
wood energy