Why should people volunteer

This device blocks an opening along the base/floor of stairs or other walking or working surfaces where materials or body parts might otherwise inadvertently fall through. it should be 4 inches high, with not more than ¼ inch clearance above the floor

The travels of marco polo.what is the author’s purpose for writing this text?

Read the excerpt from it's our world, too! : young people who are making a difference.the author’s purpose in this excerpt is to