Convection causes large masses of rock to rise from and sink into Earth's mantel. The main heat source for this movement is 1.Earth's maritle and core.
2.Friction produced by plate motions.
3.Radiation from the sun
4.Magma in Earth's crust.

Political boundaries are determined by the political party in control at the time. true or false

What factors of japan’s geography make it necessary for it to import so many goods?

The us and canadian governments are doing all of the following to combat environmental problems except a. encouraging the use of public transportation b. enacting clean water policies c. requiring emissions testing d. limiting animal populations in some regions