Which steps do geologists use to find the epicenter of an earthquake? Select three options.

They look at data from at least three seismographs.
They locate the point where circles intersect one another.
They measure the difference between arrival of P waves and S waves.
They draw circles around the epicenter from three locations.
They obtain information about the intensity of earthquakes from seismographs.

They look at data from at least three seismographs

They locate the point where circles intersect one another.

They measure the difference between arrival of P waves and S waves

Explanation:

Geologists look data from seismographs to find epicenter of an earthquake. They locates the point where circles intersect. The epicenter of earthquake is point where earth surface is vertically above hypo center. The geologist measure the difference between P waves arrival and S waves arrival.

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally