Sylvia is learning to knit. Her grandmother patiently demonstrates, then allows Sylvia to practice. When Sylvia cannot remember how to continue, her grandmother demonstrates the next step in the process, then guides Sylvia in performing that step. This demonstrates Vygotsky's concept of.

Scaffolding

Explanation:

Scaffolding and zone of proximal development are the methods of educational settings. These methods help students learn more and more they can learn something new. The instructional scaffolding is also known as the Scaffolding. This method help students to learn by working with the teacher. Through this process so that students can achieve their main goal. Scaffolding is part of the proximal zone of development.  

Thus here Sylvia is learning to knit. Her grandmother told her and then she did. Sylvia forgets how to do it again, her mother helps her to learn this process.

loess contribute to the flooding of rivers by providing the silt that is washed into rivers and constantly raises the bed of the rivers. this elevation above the surrounding flood plains and dams allow the river to overwhelm the dams and flood thousand of square miles of neighboring flood plains.

because this was the year that the state of israel was formed