Earth's Changing Crust Sheena, Marty and the Down to Earth Club members watch a homemade volcano erupt, prompting them to explore the causes and effects of changes to the Earth's surface.
(Earth's Changing Crust Sheena, Marty and the Down to Earth Club members; watch; a homemade volcano erupt) (them; to explore; the causes and effects of changes to the Earth's surface)
Earth's Changing Crust Sheena, Marty and the Down to Earth Club members them
watch to explore
a homemade volcano erupt
the causes and effects of changes to the Earth's surface