The phrase "amounts occur" is correct and usable in written English.
It can be used in contexts where you are discussing the occurrence or presence of certain quantities or values, often in statistical or analytical discussions.
Example: "In the study, it was found that significant amounts occur in the data set, indicating a trend."
Alternatives: "quantities arise" or "values appear".
Although helium occurs in Earth's atmosphere only to the extent of 1 part in 200,000 (0.0005percentt) and small amounts occur in radioactive minerals, meteoric iron, and mineral springs, great volumes of helium are found as a component (up to 7.6percentt) in natural gases in the United States (especially in Texas, New Mexico, Kansas, Oklahoma, Arizona, and Utah).
Statewide, the highest rainfall amounts occur during the summer months.
Snow is uncommon and measurable (≥0.1 inches) amounts occur in less than 60% of seasons.
Precipitation in winter falls mainly as snow, with the heaviest amounts occurring in the T'aebaek Mountains.
Values in the range of 1.50 47.3 μg g−1 were found, with smaller amounts occurring as free phenolic acids.
Precipitation is meager in the cold, stable air (in most cases, 5 to 50 cm [2 to 20 inches]), with the largest amounts occurring on the coastal margins.
Higher amounts occurred along the Delaware River, peaking in the state at 10.6 feet (3.2 m) in Burlington.
In some areas, high mountain peaks contributed to high precipitation totals, and the highest amounts occurred in southern Honduras.
Uterine bleeding of variable amounts occurring between regular menstrual periods.
Then the increase in Hgf and Cyclin D1 RNA amounts, occurring at 36 and 40 h in WT mice, respectively, appeared only at 40 and 44 h in Gstp1/2 −/− mice.
In diploid species the evolutionary changes in DNA amount occur in the whole-chromosome complement and are proportional to chromosome length, maintaining karyotype uniformity (Poggio et al. 2007).
