Ocean Acidification (virtual urchin review)

How much of the Earth is covered by oceans?

• 1/3

• 1/2

• 2/3

• 3/4

How has atmospheric carbon dioxide changed over the time period shown in the graph?

• increased

• decreased

• remained the same

• fluctuated between increasing and decreasing

Tags

NGSS.MS-ESS3-5

What does pH measure?

• carbon dioxide levels

• acidity

• oxygen levels

• size

Which pH values are basic?

• 13

• 6

• 10

• 7

Is ocean water acidic, basic, or neutral?

• basic

• acidic

• neutral

Which range of pH values corresponds with the changes in pH of the ocean over the past 20 million years?

• 7.0-7.6

• 8.0-8.3

• 8.7-9.2

• 2.2-6.7

Tags

NGSS.HS-ESS2-5

NGSS.HS-ESS3-5

What pH is expected for ocean water in 2050?

• 7.9

• 7.7

• 8.0

• 8.1

Based on the graph, are carbon dioxide levels at homeostasis?

• yes

• no

Tags

NGSS.MS-ESS3-5

Based on this graph, is ocean acidity at homeostasis?

• yes

• no

The pH scale is logarithmic. This means that a change in pH from 1 is 10x more acidic than a pH of 2. A change in pH from 8.2 to 8.0 means that the solution is _______ more acidic.

• 20%

• 2%

• 60%

• 8.2%