Volcanoes release a hazy smoke called . Steven Businger helped develop a that predicts how this smoke spreads. To model the smoke conditions, scientists measure the amount of gas a volcano is spewing.

Read the sentence. on days when i go jogging in the morning, my mind seems to process ideas faster, and my mood is more positive. how does the underlined clause add variety and meaning to the sentence? select two options. it describes the days being discussed. it makes readers want to go jogging. it creates a compound-complex sentence. it adds detail about the speaker’s personality. it explains why jogging is beneficial.

Read this passage from william faulkner's the sound and the fury: i says no i never had university advantages because at harvard they teach you how to go for a swim at night without knowing how to swim and at sewanee they dont even teach you what water is. i says you might send me to the state university; maybe i'll learn how to stop my clock with a nose spray and then you can send ben to the navy i says or to the cavalry anyway, they use geldings in the cavalry. which best describes the narrator's tone in this passage? a. bitter b. angry c. sarcastic d. all of the above

Aids is growing fastest in the poorest countries of africa. these nations don’t have enough doctors, medical labs, or money for medicine. a recent study showed that only a small percentage of hiv-infected children in africa are getting any medical treatment at all. what central idea is emphasized in both sources? the hiv/aids epidemic in africa is serious. the hiv/aids epidemic in south africa is serious. the hiv/aids epidemic among african children is serious. the hiv/aids epidemic among south african children is serious