How can a country improve the problem of illegal immigration (Answers searched from the internet are not allowed)

Which of the layers of the earth has the following three characteristics? i. it is made of molten rock. ii. it has currents that are constantly moving. iii. earth’s plates float on top of its currents.

What is the name for the famous "ring" of volcanos? a. ring of flames b. ring of fire c. ring of lava d. ring of death

Who believed that the universe was made of tiny uncuttable particles