4. Volcanic rocks are often classified based on color, as follows: rhyolite andesite basalt grey, pink dark grey black The color of volcanic rocks is partly related to the proportion of silicon dioxide they contain. Which of the rocks listed on the Data Sheet tend to have the highest proportion of silicon dioxide? The next highest? The lowest?

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answer;

medical directors

explanation;

medical directors grants and supervises the privilege or permission to use an aed on an ambulance.

other roles of a medical director includes;

-provide medical leadership, including coordination with local ems and 911 centers.

-provide guidance in equipment selection and deployment

-develop guidelines for responder actions

-oversee medical care that is rendered through the program, including review of all responses to medical emergencies

-ensure appropriate initial training and skill maintenance

-assume overall responsibility for the conduct and operation of all patient care related activities