It is Friday evening, and Alex is at home. He is hungry and wants to make a pizza for dinner. He goes to the kitchen and sees his mom. “Mom, can I make a pizza?” he asks. His mom smiles. “Yes, of course. I can help you.” Alex opens the fridge and takes out some pizza dough. He puts it on the table. His mom gives him a rolling pin. “Roll the dough,” she says. “Make it flat and round.” Alex rolls the dough slowly. The dough becomes bigger and thinner. Alex is excited. Next, his mom takes a jar of tomato sauce. She opens it and gives Alex a spoon. “Put the sauce on the dough,” she says. Alex spreads the sauce everywhere. The dough becomes red. Then his mom brings a bowl of cheese. “Now add the cheese,”…