The two conditions required for thunderstorms are:
1 warm, dry air and lightning
2 cold front lifting warm, moist air
3 rapidly sinking cold air
4 rapidly rising air heated from ground

[ou.01jthe greatest speed with which any physical object moves is 300,000 km/soundsec. which of the following has a speed of 300,000 km/sec? a.light in water b.light in vacuum c.sound in air. d. sound in water

Simple astronomical telescope the objective lens has a focal length of 75 cm and that of a piece of 5cm of the lenses are 18 cm apart when will be final image of a distant object before

Which is not part of the definition of a family? two or more related people living together being married or in a partnership a single person living alone choices a and b