Many of the oxidized zones (called supergene zones) of metal deposits in the region were removed by glaciers leaving mostly just sulfides which generally are massive and not aesthetic at the majority of locations in the region. Finding just one pyromorphite or wulfenite crystal at a lead deposit...
Where do ocean currents come from? What is the surface area of the Southern Ocean? What type of magma forms at mid-ocean ridges? What are the three main zones of the open ocean? Where are ocean acidification hotspots located? How does a mid-ocean ridge form? Where are volcanoes located ...
a) where the earth's crust is especially thick as a result of water seeping into the core from the surface. b) when the earth's core erupts onto the surface in subduction zones or in rift valleys. c) after earthquakes have damage Magma erupting to the surface is calle...
aRifts contain fractures that serve as passageways for magma originating in the mantle. Rift zones account for most of the places where lava flows onto Earth’s surface. Fissure eruptions often occur along rift zones. These eruptions form lava that cools and solidifies into basalt, the most ...
Why go: Gorongosa National Park occupies nearly one million acres in Mozambique’s Great Rift Valley and has thriving populations of lions, elephants, wildebeests, buffalo, and hippos. But it wasn’t always this way. A brutal civil war that started in 1...
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Water has unique chemical properties. Where does ice form in rivers or lakes in extremely cold weather? Why? What would happen to organisms on the planet if water behaved as most other chemicals do? What has happened to water flows in the Colorado River since 196...
Volcanoes are formed . a) where the earth's crust is especially thick as a result of water seeping into the core from the surface. b) when the earth's core erupts onto the surface in subduction zones or in rift valleys. c) after earthquake...