Polymer clays or plasticine clays are made of synthetic plastics and require âcuringâ or low heat to harden. They stay moldable for a very long time if stored properly in a plastic or metal box (no paper or fabric that would absorb the moisture). Polymer clays are usually very smooth and have a silky feeling.
On average, 4th graders are 9-10 years old because that is the normal age for the grade. But kids could potentially be anywhere from about 8 to 11 years old, since some kids hâ¦ave to repeat a year in school and get behind, and then some kids are a year ahead or have late birthdays before the cut-off date.
Other ED Facts: â¢ One half of 4th grade girls are on a diet. â¢ The average US woman is 5â4â and weighs 140 pounds. In contrast, the average US model is 5â11â and weighs 117 pounds. â¢ 51% of nine and ten-year-old girls stated they felt better about themselves when they were adhering to a diet.