Students are introduced to the water cycle. They help draw a picture of a lake ecosystem, adding human impacts that affect water quality. Students help fill in the components of a drawing of a water system. At the end of the lesson...

What caused the collapse of the environment on Rapa Nui (Easter Island)? Who constructed the Moai? What was their purpose? Class members assume the role of investigators and use evidence drawn from field studies, ships' logs, and...