feedstock

"Many plastic toys are made from petrochemicals derived from crude oil. "

"The input from the students during the class discussion was very helpful. "

"Asphalt, composed of oil and sand, is a widely used material for roads."

"The prices of groceries have increased recently. "

"The factory used petroleum to fuel its machinery. "

"The school principal is constituting a new student advisory board to improve communication. "

"I had no shallots so I substituted onion."

"A portion of your mortgage payment goes to reduce the principal, and the rest covers interest."

"Bio-materials may be substituted for petrochemical feedstocks as petroleum prices rise."

"My grandfather was a skilled industrial during the 1950s. "

"The process of baking a cake involves several steps, from mixing the ingredients to putting it in the oven. "

"Asphalt, composed of oil and sand, is a widely used material for roads."