Question

The graph below shows the approximate average annual ocean heat content from 1993 to 2020. It was created using data from NOAA. Line 1 represents ocean levels from the surface to 2,300 feet below ocean surface. Line 2 represents ocean levels from 2,300 feet to 6,560 feet below ocean surface. Line 3 represents ocean levels below 6,560 feet under the ocean surface. Graph shows the average annual ocean heat compared to the 1993 average represented as the 0 baseline from 1993 to 2020. Vertical axis shows ocean heat content measured in 10 to the 21 power joules. It starts at negative 60 and goes up to 180 in increments of 20. The horizontal axis shows years from 1995 to 2020 in multiples of 5 years. From 1995 to 2020, Line 1 starts at 20 and has an average growth of 7 vertical units per year. From 1995 to 2020, Line 2 starts at negative 20 and has an average growth of 4 vertical units per year. From 1995 to 2012, Line 3 starts at 0 and has an average growth of 1.3 vertical units per year. Data Source: © 2021 NOAA Which statement describes the approximate average trend of ocean heat content between 2,300 and 6,560 feet under the ocean during this time period? An increase of about 130 x 1021 joules An increase of about 80 x 1021 joules A decrease of about 20 x 1021 joules A decrease of about 80 x 1021 joules

Answer 1

The heat content change between 1993 and 2020 is lowest in the ocean levels below 6,560 feet.

• The statement that describes the approximate average trend of ocean heat content between 2,300 and 6,560 feet is; An increase of about 80 × 10²¹ joules

Reasons:

The graph that represent the heat content levels of the ocean at 2,300 feet to 6,560 feet is line 2

From the graph, we have;

The ocean heat content in 1993 = -20 × 10²¹ joules

The ocean heat content in 2020 = 60 × 10²¹ joules

The increase in heat content between 1993 and 2020 is therefore;

ΔH = 60 × 10²¹ - (-20) × 10²¹ = (60 - (-20)) × 10²¹ =  (60 + 20) × 10²¹ = 80 × 10²¹

The increase in heat content between 1993 and 2020 = 80 × 10²¹ joules

The correct option is; An increase of about 80 × 10²¹ joules.

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