million square km
Use the information, Figure 2, and Table 1 below answer Questions 4 and 5.22A svitsmmuz Ɛ sly a
Arctic sea ice reaches its minimum each September. Figure 2 and Table 1 below show the extent
-average
monthly
amount of Arctic
sea ice - each September since 1979. The data are derived
from satellite observations.
8
Figure 2. Average monthly Arctic sea ice extent from 1979 to 2018
MulSea Ice
www
6
n
Sea Ice
Extent
Year
Extent
(million
Year
(million
5
square km)
square km
1979
7.00
1999
6.20
1980
7.90
2000
6.40
3
1980
1985
1990
1981
7.20
2001
6.80
1995
2000
YEAR
2005 2010 2015 2020
1982
7.30
2002
5.80
Source climate nasa.gov
1983
7.50
2003
6.20
Table 1. Average monthly Arctic sea ice extent from 1979 to
1984
6.80
2004
6.10
2018
1985
6.80
2005
5.50
4. Compare the rate of change in sea ice extent during 1979-
1998 to the rate of change during 1999-2018. Use a
computational model or mathematical reasoning to
support your comparison. Show your work.
1986
7.40
2006
6.00
1987
7.30
2007
4.20
1988
7.50
2008
4.70
1989
7.20
2009
5.30
1990
6.30
2010
4.90
Rate of change = (change in sea ice extent) / # of years
1991
6.50
2011
4.50
1992
7.30
2012
3.40
1993
6.20
2013
5.20
1994
7.20
2014
5.30
1995
6.10
2015
4.60
1996
7.60
2016
4.30
1997
6.80
2017
4.80
1998
6.40
2018
4.60

What is the rate or change equal to the change in sea ice in extent and the number of years