What is poor service delivery

Hey, i was what is consisted in a sustainable city? like what unique designs they have, etc. for answering ; )

Which of these is a drawback of using natural gas? a. it is fairly safe for use in homes. b. it burns more cleanly than crude oil products. c. scientists have developed new ways of extracting it. d. during its extraction, groundwater can be contaminated.

Which descriptions refer to cirrus clouds? check all that apply. are fluffy are wispy produce snow form at high altitudes form from ice crystals