The phrase "activities dropped" is correct and usable in written English.
It can be used to indicate that certain activities have been discontinued or ceased.
Example: "Due to budget cuts, several activities dropped from the program last year."
Alternatives: "activities discontinued" or "activities eliminated".
And BTR activities dropped by 50% as the FSA concentrations were increased from 8.0 × 10−8 to 2.0 × 10−4 mg H2SO3-S/L.
We also performed chronopotentiometric experiments in which we found that the OER activities dropped rapidly because of fast dissolution of Ru and Sr cations, making it difficult to obtain accurate measures, so we decided to present only potendiodynamic results.
Revenue from its core corporate and investment banking activities dropped almost 37 percent, to 1.2 billion euros, the result of "a challenging environment in the debt markets, with very weak activity in the primary market especially in Europe, and the effects of the European sovereign debt crisis on secondary markets".
The group's activities dropped off in 2010 after two of its leaders were arrested on serious hooliganism charges; both men were released last spring on bail, with the assistance of $20,000 donated by the British street artist known as Banksy.
But the researchers say the drop in adult activities can't be explained by time spent on homework or extracurricular activities, because time on those activities dropped among eighth and tenth graders and was steady for twelfth graders and college students.
In the present study, RNAi of the two trehalase genes decreased their transcription levels (Figure 5C), and their enzyme activities dropped accordingly (Figure 5E).
DCMS statistics already evidence that participation in arts activities in schools is dropping, with participation in music activities dropping from 55.3% to a worryingly low 37.2% between 2009 and 2013/14.
The Institute for Supply Management reported on Friday that manufacturing activity dropped in October for a second consecutive month.
Eurozone manufacturing activity dropped for the fifth month and barely avoided contraction.
In the years following World War II, for example, collecting activity dropped worldwide.
That activity dropped to almost nothing in the 15 years following the collapse of the Soviet Union.
