The presence of sedimentary rock indicates that what event has taken place?

Which of the following statements about the migration of workers to other countries is false?

[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

What is one early technological advance that shaped culture? a the use of fire b the discovery of arable land c family units. d migration