Which of the following materials or features are not found at mid-ocean ridges?
A) Basaltic lava eruptions emitted along the ridge
B) Stands higher above the surrounding seafloor
C) Deep submarine trenches
D) Thin layers of sediments
Answer: C
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Since 1900, greenhouse gas emissions associated with burning fossil fuels and deforestation have warmed Earth's atmosphere by approximately ________
A) 0°C B) 3°C C) 1°C D) 5°C E) 8°C
The primary resource for the Native Americans who lived on the plains between the Mississippi River and the Rocky Mountains was
A. deer B. salmon C. bison D. groundhogs
Which water mass is characterized by relatively constant temperature and salinity with depth?
a. surface zone b. deep zone c. pycnocline zone d. halocline e. thermocline
Secondary sewage treatment is designed primarily to ________
A) remove the dissolved organic matter B) pretreat wastewater on its way to tertiary treatment C) remove hazardous chemicals such as pesticides and heavy metals D) remove the solids E) remove all bacteria and microorganisms