?

ACT® Science

Free Version

Upgrade subject to access all content

Difficult

Tenth of a Degree

ACTSCI-TAR8BW

As controversy continues to simmer concerning global warming, scientists have been studying the frigid waters around Antarctica, concerned about the melting ice, a lowering overall salt concentration in the water, and how these changes may impact both the local and global ecosystems. Below are the results of two studies collected by researchers concerning water changes.

Study #1-Location: Southern Ocean. Average Water Depth-180 meters. Data collected at 45 m.

Year Water Temperature (Celsius) % Salination of Water
1975 1.4 3.1
1985 1.6 3.0
1995 1.7 2.9
2005 2.0 2.86
2015 2.2 2.75

Study #2-Location: West Weddel Sea. Average Water Depth-75 meters. Data collected at 45 m.

Year Water Temperature (Celsius) % Salination of Water
1975 1.52 2.9
1985 1.52 2.9
1995 1.49 2.9
2005 1.49 2.9
2015 1.41 2.9

“A tenth of a degree rise in water temperature close to a big ice shelf can melt the ice significantly faster than raising the air temperature by the same amount.”

This statement would best be a conclusion drawn from what evidence?

A

The 1995 West Weddel Sea water temperature.

B

The average water depth in the Southern Ocean.

C

The 1975 West Weddel sea salt percentage

D

The 2015 Southern Ocean temperature data.