Explain how an index fossil record can be used to help determine the age of other fossils.

Which theory suggested that the earth was once a signle supercontient that gradually that broke up into the contients that we know today

The earth is composed of three different chemical layers: core, mantle and crust. the formation of these layers was from a process called

[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