
What do the white arrows in the model represent?
A penguin is part of which system?
Molten rock (lava) is part of which system?
A lake is part of which system?
Oxygen is part of which system?
Which 2 systems together form a hurricane?
The spheres depend on one another?
Which sphere can the biosphere survive without?
The warming of the Earth's atmosphere, land, and water is called _____________.
The fish in the model are part of which Earth sphere?