Whipped cream is made by whisking or mixing air into cream with more than 30% fat, to turn the liquid cream into a soft solid. Nitrous oxide may also be used to make whipped cream.
Grass conserves water and cleans the air. Grass traps water and reduces soil erosion. The average grassed yard can absorb more than 22.7 m3 (6,000 gallons) of rainwater. [aitc.oregonstate.edu]
