According to Wegener, what happend about 200 million years ago?

When a piece of shiny silver jewelry gets tarnished, what has happened?

Whats the definition of catastrophism

Crude oil is separated into different substances such as gasoline, petroleum, diesel fuel, and propane by which process? Osmosis Chromatography Filtering Fractionation

An ion from a given element has 82 protons and 80 electrons. what is the charge on the ion? what is the name of the element? what is the symbol for the ion?

What units are used to measure energy? A) volts B) angstroms C) centimeters D) joules

Which statement (s) is/are true of acid-catalyzed alcohol dehydrations? A) Protonation of the alcohol is a fast step. B) Formation of a carbocation from the protonated alcohol is a slow step.

Water is composed of hydrogen and oxygen, True Or False

Why must chromosomes be copied before cells divide

4) Terry's dog is racing down the lane in the part toward the east. The dog travels 36 meters in 18 seconds before it stops running. The velocity of the dog is. A. 2 m/s east B. 4 m/s east C. 8 m/s east D. 10 m/s east

When a unicellular organism grows, the number of its cells increases. (True or False)