The plate tectonic theory can best be described as

a. earth's natural process by which its lithospheric plates slowly move about because of movement in the asthenosphere
b. a process by which the asthenosphere is heated and creates convection cells
c. a dynamic process of the earth's interior by which the inner core produces a magnetic field
d. an idea that the continents used to resemble a supercontinent, pangaea, but have now drifted apart

President nixon's trip to china included apex

Which one of the following statements best characterizes change to agriculture in the united states since 1900

Which of these is a role of congress? a) to veto legislation b) to pass the federal budget c) to nominate cabinet members d) to interpret the constitution 2) which of these is a power of the legislative branch? a) declare war b) enforces laws c) interprets laws d) negotiates treaties 3) a two/thirds vote of each house of congress is required to a) impeach the u. s. president. b) approve presidential appointments. c) pass an appropriation or tax bill. d) pass a bill over the president's veto. 4) the chief purpose of congressional committees is to a) draft legislation for consideration by the full congress. b) act as a group to which the president can direct his lobbying effort. c) provide a place for lobbyists and special interest groups to get support. d) hold hearings so that bills can be evaluated and studied prior to voting. 5) after a bill has been passed by both houses of congress it a) becomes a law. b) is sent to the president. c) returns to the house of origin for verification. d) is sent to a subcommittee in the house or senate. 6) house of representatives passes a spending bill → senate debates the spending bill → senate passes the spending bill → ? what completes this sequence of events? a) the spending bill becomes a law b) the states must approve the bill c) the supreme court reviews the bill d) the president must act on the bill eliminate