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1621.When a warm air is lifted off the surface in temperature depression it is called ____?
1622.When an acid reacts with a metal, which one of the following gas is usually liberated?
1623.When did Amnesty International won the Noble Prize:
1624.When in the part of its orbit closest to the Sun, Pluto has an atmosphere of nitrogen and methane similar to Triton’s, but what happens when it is farther from the Sun ?
1625.When oil and gas resources are burnt they kill many forests and lakes by ____ ?
1626.When our sun reaches the end of its red giant phase, it will turn into a____?
1627.When Pluto was cast out from the list of Planets?
1628.When sound waves travel from air to water which of the following quantities remains unchanged?
1629.When sugar is added to water, its boiling point:____?
1630.When water is filled in a bottle and is allowed to freeze, the bottle breaks because