The material discusses the possible causes of the mass extinction that happened at the end of the Triassic period. While the reading suggests three explanations of this phenomenon, the listening challenges all these theories and states that they are not convincing.
First, the author mentions that this extinction happened due to the change of sea level that destroyed all species that lived on the coast. On the other hand, the professor opposes this and points out that there was a fluctuation that happened at the sea level, but usually, the species that habituated the coast and shallow water adapted any environmental changes that happened gradually. The lecturer brings up that the change that was in the sea level during the end of the Triassic period occurred gradually, so it could not cause this aggressive extinction.
Second, the writer states that the extreme cooling climate that happened due to volcanic activity devastated many species because it released a huge amount of sulfur dioxide that reduced the global temperature. On the contrary, the lecturer encounters this and posits that sulfur dioxide released from volcanic activity stayed in the atmosphere for a short period. According to the listening, sulfur dioxide was cleared out from the atmosphere by combining with water and fell as rains. The lecture says that sulfur dioxide did not stay long enough to cause a massive cooling climate that led to this extinction.
Third, the reading cites that an asteroid hit the Earth and threw a lot of debris in the atmosphere that blocked the sunlight and killed many animals and plants. Conversely, the professor contradicts this and contends that when an asteroid hits the Earth, it causes carter. The lecturer argues that they did not find any carter that dated back to the end of Triassic period. the professor explains that the only carter that had been found dated back twelve million years before the Triassic period, so it is too long before extinction to do anything with it.
The material discusses the possible
causes
of the mass extinction that
happened
at the
end
of the Triassic
period
. While the reading suggests three explanations of this phenomenon, the listening challenges all these theories and states that they are not convincing.
First
, the author mentions that this extinction
happened
due to the
change
of sea level that
destroyed
all species that
lived
on the coast.
On the other hand
, the professor opposes this and points out that there was a fluctuation that
happened
at the sea level,
but
usually
, the species that habituated the coast and shallow water adapted any environmental
changes
that
happened
gradually
. The lecturer brings up that the
change
that was in the sea level during the
end
of the Triassic
period
occurred
gradually
,
so
it could not
cause
this aggressive extinction.
Second, the writer states that the extreme cooling climate that
happened
due to volcanic activity devastated
many
species
because
it released a huge amount of sulfur dioxide that
reduced
the global temperature.
On the contrary
, the lecturer encounters this and posits that sulfur dioxide released from volcanic activity stayed in the atmosphere for a short
period
. According to the listening, sulfur dioxide
was cleared
out from the atmosphere by combining with water and fell as rains. The lecture says that sulfur dioxide did not stay long
enough
to
cause
a massive cooling climate that led to this extinction.
Third, the reading cites that an asteroid hit the Earth and threw
a lot of
debris in the atmosphere that blocked the sunlight and killed
many
animals and plants.
Conversely
, the professor contradicts this and contends that when an asteroid hits the Earth, it
causes
carter. The lecturer argues that they did not find any carter that dated back to the
end
of Triassic
period
.
the
professor
explains
that the
only
carter that had
been found
dated back twelve million years
before
the Triassic
period
,
so
it is too long
before
extinction to do anything with it.