Final answer:
The type of play represented by Jill and Hannah in the sandbox, where they share a shovel and work on separate parts of a play scenario, is known as cooperative play. This form of play helps children learn important social skills such as sharing and teamwork.
Step-by-step explanation:
The scenario described involves Jill and Hannah playing in a sandbox where Jill is building sandcastles, and Hannah is making a lake. When Jill asks to use the shovel and Hannah gives it to her, this is an example of cooperative play. Cooperative play is a type of play where children engage with each other in a shared activity, working together towards a common goal or simply sharing resources as in this case.
Through cooperative play, children learn valuable social skills such as sharing, negotiation, and teamwork. They also experience the joys and challenges of social interactions, which can contribute to their emotional and social development. Jill and Hannah are not only having fun but are also learning about the world through their interactions and the roles they assume during playtime.