open response (10 points each)
directions: be sure to read each part of the question and then answer in complete sentences.
21. the data below provides the average date of the first breakup of ice on the tanana river at nenana, alaska for four decades.
21a. use the data to construct a bar graph of the average date of the first ice breakup for each decade.
21b. state and explain one possible cause of the difference in the average date of the first ice breakup shown in the data table.
21c. explain how melting ice at the poles could affect other areas on earth.
21d. the graph below displays changes in sea level. on this graph, a measurement of 50 means that the sea has risen 50 millimeters. explain how the data you added to the bar graph above could be related to the data shown in this graph.
(table for 21a:
decades | average date of first ice breakup
1960–1969 | may 7
1970–1979 | may 5
1980–1989 | may 4
1990–1999 | april 29
bar graph for 21a is partially drawn with dates from april 27 to may 9 and decades 1960–1969, 1970–1979, 1980–1989, 1990–1999
graph for 21d: sea level change (mm) with years from 1900 to 2020 and a line graph showing sea level change)

Question

Accepted Answer

# 21a.
# Explanation:
## Step1: Identify axes and data
X-axis: Decades; Y-axis: Ice Breakup Dates
## Step2: Plot each decade's data
- 1960-1969: Bar aligned to May 7
- 1970-1979: Bar aligned to May 5
- 1980-1989: Bar aligned to May 4
- 1990-1999: Bar aligned to April 29
# Answer:
(Bar graph with four vertical bars, each corresponding to a decade, matched to their respective average ice breakup dates on the y-axis as plotted above)

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# 21b.
# Brief Explanations:
One possible cause is rising global temperatures from climate change. As atmospheric temperatures increase over time, ice melts earlier, shifting the average breakup date to an earlier point in the spring.
# Answer:
A likely cause is climate change-driven global warming, which raises temperatures over decades, leading to earlier ice melt and earlier average first ice breakup dates.

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# 21c.
# Brief Explanations:
Melting polar ice adds more freshwater to the ocean, which raises global sea levels. Higher sea levels can cause coastal erosion, flooding of low-lying coastal areas and islands, and disrupt coastal ecosystems and human settlements. Additionally, the influx of cold freshwater can alter ocean current patterns, which regulate global climate systems, leading to shifts in regional weather patterns.
# Answer:
Melting polar ice increases global sea levels, causing coastal flooding/erosion, displacing coastal communities, and disrupting coastal ecosystems. It can also alter ocean currents by adding freshwater, shifting regional climate and weather patterns.

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# 21d.
# Brief Explanations:
The sea level change graph shows a steady rise in global sea levels over time. Earlier ice breakup on the Tanana River (from the bar graph) indicates regional warming in Alaska, which is consistent with the global warming trend that causes polar ice melt and subsequent sea level rise. Both datasets reflect the broader pattern of increasing global temperatures driving changes in ice and ocean systems.
# Answer:
The earlier average ice breakup dates (from the bar graph) signal regional warming in Alaska, which aligns with the global warming trend that causes the steady sea level rise shown in the line graph—both are linked to rising global temperatures driving ice melt and ocean changes.

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QUESTION IMAGE

Question

Explanation:

21a.

Step1: Identify axes and data

Step2: Plot each decade's data

Answer:

21b.