Which statement is true?

a bill moves from the house to the white house.
h. r. signifies a house bill and s signifies a senate bill.
the president pro tempore gives the final vote on a bill.
a standing bill is one that has been passed as a law.

H.R. signifies a House bill and S signifies a Senate bill.

Explanation:

When a bill is introduced it receives a number and a letter before it referring the chamber from which the bill came from. H.R. is used for the bills introduced by the House of Representatives while S. is used for the bills introduced by US Senate.

When the bill is voted in the House it goes to the Senate, it must pass in both houses of Congress before it goes to the White House. It is the US President that gives the final vote on a bill, the president pro tempore is a temporary substitute for the presiding officer of the senate when the vice-president can't attend. When a bill has been passed as a law it is called statute or an act of the legislature.

the causes of the dust bowls were severe droughts,   lands became dry and hard, temperature was higher than usual, hot and dry conditions killed crops, high winds. because of those factors, the winds kicked up dry soil and created clouds of dust.

civil disobedience, refusal to obey the demands or commands of a government or occupying power, without resorting to violence or active measures of opposition