Search over 10,000 free study notes

It's better to think of the subjunctive as a mood rather than a tense. As a general rule, it is used to express a feeling of uncertainty in a sentence. Here are the main situations where the verb will need t...

This is the minimum initial velocity required to move from a point to infinity in a gravitational field. Infinity is defined to have a potential, V of zero; this is the point where the gravitational field ha...

Seismic waves are shock waves released by the rupture of rock duing an Earhquake. Seismic waves radiate from the focus of the earthquake and travel through rocks. Primary waves (P-waves) are compressional wa...

Endosymbiosis is where two organisms live together, one inside the other: endo=in, sym=together and biosis=living. It is believed that mitochondria originated as eubacteria that were intracellular parasites ...

Radioactive deacay in the Earth's core creates extremely high temperatures which heat the lower mantle. When radioactive decay is concentrated, local thermal currents are generated in the lower mantle. Plume...