Which statement describes the focus of an earthquake? It creates stress in rock.
It develops in the lithosphere.
It lies above the surface where rock breaks.
It begins about 5 kilometers below Earth’s surface.

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

Which property of a rock remains unchanged by mechanical weathering? a. total surface area b. size and shape c. mineral composition d. sharpness

What is the effect of returning nuclear reactor cooling water back into bodies of water?