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SCI8-EarthSyst
Altering earth systems (EPISD 8th grade)
Question | Answer |
---|---|
Convergent boundary | When plates smash into each other |
Transform boundaries | When plates move sideways like the San Andres Fault |
Divergent boundaries | When plates move apart from each other |
Subduction | When one plate is pushed under another and the crust sinks down into the mantle |
Seafloor spreading | An underwater divergent boundary. May cause ridges and mountains. |
Continental drift | The theory that all land masses were one supercontinent, called Pangaea, and have slowly moved apart. |
Plate tectonics | The theory that the earth’s plates move on currents in the mantle. |
Desertifications | When land is no longer fertile and won’t support plants and trees |
Pesticides | Bug poisons that may unintentionally harm species other than bugs |
Natural events | Events that may endanger species, but are not caused by humans |
Subsidence | When land sinks because water is lost from particles between the rocks and sand |
Land reclamation | When land is restored to a more natural or usable state |
Predation | When one species hunts another for food |
Inexhaustible resources | Resources like the sun and wind that can never be used up. |
Physical weathering | An example of this is ice freezing in a crack which causes the rock to break or crumble |
Renewable resources | Resources that can be used again and again like trees and water |
Chemical weathering | An example of this is when CO2 reacts with water in caves and cave formations are created |
Non-renewable resources | Fossil fuels are an example of this type of resource. |
Habitat destruction | When the resources an animal uses are ruined |