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The material discusses the possible causes of a mass-extinction at the end of the Triassic period.

The material discusses the possible causes of a mass-extinction at the end of the Triassic period. 15PN7

The material discusses the possible causes of a mass-extinction at the end of the Triassic period. While the reading looks at the topic from one perspective, the listening challenges certain points outlined in the reading passage. Firstly, the reading details the points regarding this topic, namely sea-level change. Next, global cooling due to volcanic activity. Finally, the extinction happened because of an asteroid strike the Earth. Conversely, the lecture challenges the points, one specific contradiction is during the Triassic period sea level went down quite gradually, so habitats adapted to it. In order to have a negative impact on the ocean populations, sea-level fluctuations should happen suddenly. In addition to that, the global cooling that happened because of the volcanic activity happened for short period, because sulfur dioxide was cleared out from the atmosphere quickly, SO2 combined with water vapor and fall as rains. Consequently, the cooling period that happened at the end of the Triassic period was not long enough to cause the mass-extinction. One final point, if there was an asteroid strike during this period, there should be a astroids' crater, however, the only crater had been found dated back to 12 million years ago, which was too long before the mass-extinction.

The material discusses the possible causes of a mass-extinction at the This phrase/word (depending on the context) can be potentially replaced with :expiration
end
 of the Triassic You use this word too often, consider replacing it withtermspanstretchseasonagecourse
period
. While the reading looks at the topic from one perspective, the listening challenges certain You use this word too often, consider replacing it withstopmark
points
 outlined in the reading passage.

Firstly
, the reading This phrase/word (depending on the context) can be potentially replaced with :particulars
details
 the You use this word too often, consider replacing it withstopmark
points
 regarding this topic, namely
 sea-level This phrase/word (depending on the context) can be potentially replaced with :alteradjust
change
. Next
, global cooling due to volcanic activity. Finally
, the extinction You use this word too often, consider replacing it withhitmaterializedevelopgo onappeartranspire
happened
This phrase/word is too simple and can be replaced with:due to the factin light of the fact thatowing to the fact that
because
 of an asteroid strike the Earth.

Conversely
, the lecture challenges the You use this word too often, consider replacing it withstopmark
points
, one specific contradiction is during the Triassic You use this word too often, consider replacing it withtermspanstretchseasonagecourse
period
 sea level went down quite gradually
, This phrase/word is too simple and can be replaced with:consequently
so
 habitats adapted to it. In order to have a This phrase/word is too simple and can be replaced with:adverse
negative
 impact on the ocean populations, sea-level fluctuations should happen suddenly
. In addition
 to that, the global cooling that You use this word too often, consider replacing it withhitmaterializedevelopgo onappeartranspire
happened
This phrase/word is too simple and can be replaced with:due to the factin light of the fact thatowing to the fact that
because
 of the volcanic activity You use this word too often, consider replacing it withhitmaterializedevelopgo onappeartranspire
happened
 for short You use this word too often, consider replacing it withtermspanstretchseasonagecourse
period
, This phrase/word is too simple and can be replaced with:due to the factin light of the fact thatowing to the fact that
because
 sulfur dioxide was cleared
 out from the atmosphere quickly
, SO2 combined with water vapor and fall as rains. Consequently
, the cooling You use this word too often, consider replacing it withtermspanstretchseasonagecourse
period
 that You use this word too often, consider replacing it withhitmaterializedevelopgo onappeartranspire
happened
 at the This phrase/word (depending on the context) can be potentially replaced with :expiration
end
 of the Triassic You use this word too often, consider replacing it withtermspanstretchseasonagecourse
period
 was not long This phrase/word is too simple and can be replaced with:abundance
enough
 to cause the mass-extinction. One final You use this word too often, consider replacing it withstopmark
point
, if there was an asteroid strike during this You use this word too often, consider replacing it withtermspanstretchseasonagecourse
period
, there should be Use "an" instead of 'a' if the following word starts with a vowel sound, e.g. 'an article', 'an hour'an
a
Possible spelling mistake found.asteroids
astroids
' crater, however
, the This phrase/word (depending on the context) can be potentially replaced with :exclusively
only
 crater had been found
 dated back to 12 million years ago, which was too long This phrase/word is too simple and can be replaced with:previouslyprior to
before
 the mass-extinction. 