What is the definition of half-life?

the variable rate at which one half of a given radioisotope decays

the time required for one half of a sample of a radioisotope to decay

an observable pattern in the order at which one half of a radioisotope decays

How many molecules are present in 3 mols of silicon dioxide (sio2)?

(science)study the following ocean currents map. an ocean currents map is shown. on the map the locations for san diego, california and savannah, georgia are marked. there is a looping current from the north past san diego and a looping current from the south near savannah which statement is most likely correct about the average temperatures in san diego, california as compared to savannah, georgia? it is higher in savannah because of the cool ocean currents from the south. it is higher in savannah because of the warm ocean currents from the north. it is lower in san diego because of the warm ocean currents from the south. it is lower in san diego because of the cool ocean currents from the north.

Science and technology are interdependent. advances in one lead to advances in the other. give an example of this phenomenon.