Why was silk so interesting to the romans

According to the earth science reference tables, during which geologic time period were the continents of north america,south america, and africa closest together?

Iceland has taken advantage of its geology to meet a. political needs b. energy needs c. cultural needs d. economic needs answer b. energy needs

Triangle xyz is shown, where n ≥ 5. which statements are true regarding the sides and angles of the triangle? check all that apply. is the longest side. angle x is the largest angle. angle z is greater than angle y. is opposite the largest angle. is the shortest side.