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Earth has two sets of poles: the geographic poles and the magnetic poles. The geographic
poles are located at the northemmost and southernmost ends of the earth. The location of the
magnetic poles, on the other hand, are ( ア ) moving, This fact has several implications
for navigation and transportation.
Shifts in the position of the North Magnetic Pole are nothing new. Since 1831, scientists
have been tracking its location. The movements are caused by changes in the flow of swirling
molten iron in the earth's core which affect how the earth's magnetic field behaves. What is
surprising to scientists is the speed at which the pole has been moving in recent years.
For most of the 20th century, magnetic north was located around the northern parts of
Canada. It drifted around, moving slowly north at an ( イ ) speed of approximately 10
kilometers per year. In recent decades, that rate has increased significantly to about 55
kilometers per year. The North Magnetic Pole is now moving away from Canada toward eastem
Russia.
While scientists can't fully explain how changes in the carth's molten core are affecting
the pole's movement, they can map the earth's magnetic field. Doing so allows them to
( ウ)
hé rate of change over time. This, in turn, provides information on how the
magnetic field may shift in the future.
Information on changes to the earth's magnetic field is used to produce the World
Magnetic Model (WMM). This model is used as the basis for all fornms of modern navigation,
from how ships move at sea to mapping software in smartphones. ( エ) in the model,
caused by shifts in the real location of the North Magnetic Pole, can seriously impact almost all
foms of modern transportation.
The model is updated every five years, but in 2018, during routine checks of the 2015-
2020 model cycle, scientists noticed a problem. Because of the rapidly shifting pole, the WMM
was close to being outside the acceptable limits for navigational errors. This forced the release
of an updated version of the model、 It was revised ( オ ) in 2020, and the current version
is expected to last until 2024,
As well as keeping track of the WMM's accuracy, scientists continue investigating why
the magnetic field is changing so dramatically. This essential work will ensure a safe journey
for everyone navigating their way through the world.

(ア) 1. constantly
2. factor
3. solid
4. stay
5. timed
(イ) 1. average
2. equally
3. input
4. opcn
5. under
(ウ) 1. best
2. delays
3. finally
4. joined
5. observe
3. Deal
(エ) 1. Been
2. Capture
4. Erors
5. Natural
3. quick
2. measurement
(オ) 1. again
5. working
4. undone
S S

文法 長文 穴埋め

Answer 1

taka

(ア) 1 〇
(イ) 2 → 1 average(形容詞：平均の)＋speed(名詞：速度)
1年に約10キロメートルの速度でゆっくり北に移動していた
(ウ) 1 → 5 observe(動詞)　※allow＋O＋[to ～](不定詞) Oが～するのを許す・可能にする
そうすることにより、科学者達はゆっくり時間をかけて変化の割合を観察することができる。
(エ) 3 → 4 Errors(名詞：主語S)＋can impact(動詞V：影響を与える可能性がある)
※deal(名詞)：取引、政策、量／capture(名詞)：捕獲、保存 → 文の意味が成り立たないので✕　
このモデルの間違いは、磁北極の実際の位置の変化によって引き起こされ、ほとんど全ての現代の輸送機関にひどい影響を与える可能性がある。
(オ) 1 〇

参考にしてください。

taka

訂正：約10キロメートルの平均速度で