GB Wilson - 6th Gr Plate Tectonics and Fossils
Terms in this set (31)
the theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle
a section of earth's lithosphere that carries continents
Ecological damage of a direct geologic nature, such as volcanic eruptions and earthquakes, are geological events. The eruption at Mt. St. Helens is a recent geologic event.
violent shaking or shifting motion of the ground caused by the sudden movement of rock far beneath Earth's surface
result of a build up of heat and pressure beneath the surface of the earth being released. Usually violently
compression forces that caused folding and faulting of rock layers.
the solid, outer layer of the earth that consists of the crust and the rigid upper part of the mantle
the outer layer of the Earth
Layer of the earth below the Earth's crust; layer of the earth that is a plasticlike solid yet flows under pressure
Heating from the Earth's core drives convection/current in the upper mantle. This convection/current is extremely slow; the speed with which material in the Earth's crust spreads from the mid-ocean ridges is of the order of several cm per year. Convection = Current caused by the expansion
of a liquid, solid, or gas as its temperature rises.
the most interior zone of the earth
the perserved trace, imprint, or remains of a plant or animal
A naturally formed aggregate, or mixture, of minerals; have varied chemical compositions
Started off of as Pangea, continental drift made it split into Gondwanaland and Laurasia, Gondwanaland split into a whole bunch of southern hemisphere continents, including Australia
a sequence of related events arranged in chronological order and displayed along a line
method of determining the age of a fossil by comparing its placement with that of fossils in other layers of rock
layers of rock that are built up over a period of time
condition in which the earth's surface is worn away by the action of water and wind
a moving glacier has a zone of accumulation and a zone of wastage. modern glaciers move more slowly (a few cm a day)
abiotic environmental factors that influence organisms but are not consumed by them
(plate tectonics) a hypothetical continent including all the landmass of the earth prior to the Triassic period when it split into Laurasia and Gondwanaland
the scale used to measure the intensity of earthquakes ; assigns a single number to quantify the amount of seismic energy released by an earthquake.
magma that reaches Earth's surface
molten rock beneath the earth's surface
a small earthquake; shake with seismic vibrations
back and forth movements of matter
the process that crumbles, cracks, and breaks rocks (slow change by wind and water)
air moving (sometimes with considerable force) from an area of high pressure to an area of low pressure
The movement and endless recycling of water between the atmosphere, the land surface, and underground is called the hydrologic cycle. This movement, driven by the energy of the sun and the force of gravity, supplies the water needed to support life.
measures the shock waves of the earthquake
measure of the energy released during an earthquake