Churning was an arduous task performed with a butter churn. Monthly and quarterly churn rates can also be calculated. The hand-cranked churn, which also uses ice and salt for cooling, replaced the pot-freezer method. The catch is, the devas are not strong enough alone to churn the ocean. Many were never detonated for fear that they would churn up the ground too much. Traditional tools included the butter churn and Scotch hands. Companies usually make a distinction between voluntary churn and involuntary churn. Butter was made by beating yogurt in a churn. It was the remaining liquid after the butter was removed from the churn. Reno helped her parents churn butter the family sold to make ends meet. Like other service providers, mobile service providers losing a mobile account call it "churn". The powerful muscles of the gizzard churn and mix the mass of food and dirt. In the 1870s, he patented an improved butter churn. It is similar to the churn carrying competition. Thus, the combined Churn/Thames river would top the list.