1) Which of the following elements does NOT belongs to the alkaline earth metals?

Select the correct answer below:

calcium

magnesium

iron

strontium

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2. In nature, how do phosphate ions become available for marine food webs?

Select all that apply:

• surface runoff
•  
• groundwater flow
•  
• river flow
•  
• precipitated sediments from the ocean floor

1. Answer: Calcium, Magnesium and Strontium

2.Answer: surface runoff, groundwater flow, and river flow. 

Step-by-step explanation

1.    The group II of periodic table are called alkaline earth metal. They are Beryllium (Be), Magnesium (Mg), Calcium (Ca), Strontium (Sr), Barium (Ba) and Radium (Ra).

So, from the given list: Calcium, Magnesium and Strontium are alkaline earth metal.

But Iron falls in group 8 and it is called transition metal.

Answer: Calcium, Magnesium and Strontium

2.    The main source of phosphate in soil or water is weathering of rock and volcanic activities. Phosphate enters the oceans via surface runoff, groundwater flow, and river flow. 

Answer: surface runoff, groundwater flow, and river flow.