[Answer] 6. What could you put on a slick runway to improve braking action?

Step 1 : Introduction to the question "6. What could you put on a slick runway to improve braking action?"

...1. All of these 2. Urea (carbamide) 3. Sand (small loose grains of rock) 4. Calcium magnesium acetate (CMA) Urea is a nitrogen-releasing compound with many uses. For airports, it is used for its ice-melting ability and because it is not corrosive to aircraft aluminum. Sand provides two benefits. Heated sand will melt through the ice. Once applied, the sand also provides abrasion. The sand needs to be free of rocks that could damage aircraft engines or propellors. Calcium magnesium acetate is one type of compound that can be used. Other types are sodium acetate and sodium formate. These materials are also not corrosive to aluminum.

Step 2 : Answer to the question "6. What could you put on a slick runway to improve braking action?"

All of these:

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