Volcanic activity in the region has been monitored continuously to predict potential eruptions.
该地区的火山活动一直被持续监测，以预测可能的喷发。
An entomologist proposes that a particular species of firefly reduces its light-flashing activity in areas with high levels of artificial nighttime lighting, which may explain declining firefly populations near cities.
From a Command of Evidence: Textual question · Information and Ideas
Beavers are considered a keystone species because their dam-building activity creates wetland habitats that support a wide range of other plants, fish, birds, and amphibians that would not otherwise thrive in the area.
From a Central Ideas and Details question · Information and Ideas
An entomologist proposes that a particular species of moth reduces its activity in areas with high levels of artificial nighttime lighting, which may explain declining pollination rates of a plant that relies on the moth near cities.
From a Command of Evidence: Textual question · Information and Ideas
Which choice best defines “activity”?
D — Something that is done for enjoyment, often as part of a group. “activity” means something that is done for enjoyment, often as part of a group.
Which word means “something that is done for enjoyment, often as part of a group”?
B — activity. “activity” means something that is done for enjoyment, often as part of a group.
activity — something that is done for enjoyment, often as part of a group. In Chinese: 活动.
activity is pronounced /ækˈtɪvɪti/.
Volcanic activity in the region has been monitored continuously to predict potential eruptions. (该地区的火山活动一直被持续监测，以预测可能的喷发。)
pursuit, pastime, undertaking — all close in meaning to activity (something that is done for enjoyment, often as part of a group).
inactivity, idleness — each the opposite of activity (something that is done for enjoyment, often as part of a group).
Yes. activity is on the SAT Prep Basic list — the everyday academic words the SAT assumes you already have. The Digital SAT does not test vocabulary in isolation; words like this one are tested through Words in Context questions, where you choose the word that completes a passage most logically and precisely.