Why is indoor air pollution a serious health hazard in some developing countries?
a. the burning of coal releases significant amounts of particulates into the air.
b. people smoke more in developing countries.
c. many homes rely on indoor burning of wood or dung without proper ventilation.
d. most houses in these countries are well insulated, increasing household exposure to radiation?

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."

1. b.

2. d.

3. a.

5. d.

6. c.

these are the only ones that i know, i hope this , and good luck.