What activates a convection current, starting the flow of fluid (a) cold temperatures at the north pole (b) heated liquids at the earth surface (c) iron-rich blocks in the mantle (d) temperatures differences in the mantle

Which of the following best describes the purpose of a nation’s boundaries? a. to limit the movement of goods and people b. to make it easier for cartographers to create maps c. to make the movement of goods and people easier d. to prevent other countries from invading territory

This phrase from the declaration of independence and its primary author thomas jefferson can be used to justify which statement? a) jefferson thought this document could be used in his defense were he put on trial for treason. b) jefferson knew that the colonists' actions would have an international impact. c) jefferson believed that a bill of rights was necessary in the new government. d) jefferson was trying to show the king that the colonists were intellectuals.

At which boundary does subduction stop occurring, resulting in a mountain range?