Jawless fish and ocean reefs were devastated by which extinction?

Late Devonian

Ordovician-Silurian

Permian-Triassic

End Triassic

Cretaceous-Tertiary

What is the difference between wavelength and frequency

If you punch holes in the side of a container filled with water, in what direction does the water initially flow outward from the container?

Which of the following would increase the strength of an electromagnet?

Given a selection of ionizing particles at the same energy, which is biologically most harmful? Select one: a. alpha particles (helium nuclei) b. X-rays c. Beta particles (electrons) d. protons e. slow neutrons

If 270 million people in the United States jumped up in the air simultaneously, pushing off earth with the average force of 800 N each time of 0.10 seconds, what would happen to the 5.98*10^24 kg earth?

65 million years ago there was a mass extinction that is best known for killing the dinosaurs. There was also a large deposit of dust that contained substances only found in asteroids.

Near which location in New York State would a geologist have the greatest chance of finding dinosaur footprints in the surface bedrock?

E=mc^2 solve for c E/m m/E sqrt (E/m) sqrt (m/E) E - m sqrt (E-m)

For resonance to occur, the object must experience a frequency equal to its what? amplitude period wavelength natural frequency

Rasheed runs a football 10 meters east, turns and runs the football 6 meters west. If his velocity during this run is found to be 3 meters/second, how long does this take Rasheed to complete this run?