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Specific gravity 2.9 – 3.4

Oceanic crust is dark coloured lava, containing large quantities of iron and magnesium. The iron and magnesium content makes the lava weather easily and gives oceanic crust a greater specific gravity than continental crust. The lavas are fluid and the volcanoes have low angles (sheild volcanoes) – examples in Hawaii and Iceland.

Richard E. Meyer, Picher, Okla. from the Los Angeles Times

Acid water from abandoned mines creates peril for thousands in four southern states.

Water boiled out of a red wound in the pasture and spilled across the grass. It flecked the ragweed with rusty foam. George Mayer knew in an instant what it was.

"The damn mines," he said to himself. "The mines are full, and the water’s finally coming out."

Brian Bell, Brent Duse and Tim Venne
Chelmsford Valley District Composite School
Sudbury Region

Paul Karrow

H.H. Helmstaedt. W.A. Gorman & S.L. McBride, Department of Geological Sciences, Queen’s University, Kingston, Ontario, Canada, K7L 3N6

With proper acknowledgement all diagrams may be reproduced for teaching purposes.