What's the most insidious thing about radiation?

Which of the following is the main purpose of using an anchored network of booms which funnel debris to a collection area?

Which barrier to economic development is shown in the following examples? i. the high rate of hiv infection in underdeveloped nations ii. the use of children as soldiers in uganda’s army in the early 2000s iii. low literacy rates in underdeveloped nations with limited exposure to adequate education a. foreign debt b. political instability c. widespread disease d. low levels of social welfare

How does sea floor spreading relate to supercontinents?