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5th Grade Earth Science Constructive & Destructive Forces & Landforms
Terms in this set (47)
the outer layer of the Earth
the layer of the earth between the crust and the core
the central part of the Earth
tending to move apart in different directions -
Places where plates are coming apart
a boundary where earth's tectonic plates move toward each other. This causes a collision or subduction. This will result in the formation of volcanoes and mountain ranges.
Places where plates slide past each other
a theory stating that the earth's surface is broken into plates that move
natural features of the earth's surface
openings in Earth's crust from which molten rock, dust, ash, and hot gases flow or erupt
a molten mixture of rock-forming substances, gases, and water from the mantle
rock that in its molten form (as magma) issues from volcanos
the sudden occurrence of a violent discharge of steam and volcanic material
a shaking or sliding of the ground. It is caused by the sudden movement of masses of rock along a fault or by changes in the size and shape of masses of rock far beneath the earth's surface.
a rigid layer of the Earth's crust that is believed to drift slowly
(geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other
places where rocks have been compressed into bends by colliding plates
a repeated back and forth motion that creates a wave
Ring of Fire
a major belt of volcanoes that rims the Pacific Ocean
a measuring instrument for detecting and measuring the intensity and direction and duration of movements of the ground (as an earthquake)
a scale that rates an earthquake's magnitude based on the size of its seismic waves
the occurrence of a change for the worse
the chemical and physical processes that break down rock at Earth's surface
these happen when large blocks of rock break loose from a steep slope and start tumbling
(geology) the mechanical process of wearing or grinding something down (as by particles washing over it)
process in which sediment is laid down in new locations
huge heaps of loose wind blown sand.common in desert and beaches
a low triangular area where a river divides before entering a larger body of water
overfull with water (rivers and creeks)
land that becomes too full of water and slides down a slope
(physics) the influence that produces a change in a physical quantity
the surface features of a place or region. The topography of a region includes hills, valleys, streams, lakes, bridges, tunnels, and roads.
(biology) decaying caused by bacterial or fungal action
helpful; serving to improve or enhance; beneficial
causing destruction or much damage
used to retain water in a body of water
A way to control water flow
Positive affects of dams
1) provide protection against flooding 2) mechanism to make electricity 3) starting point for man-made bodies of water
Negative affects of dams
1) expensive to build 2) ruins habitats of animals 3) stops natural flow of water, its animals and nutrients
type of dam that runs along the banks of a river or canal
used to control flooding
Where can many levees be found ?
What are storm drains used for ?
drain excess rain and ground water from paved streets, parking lots, sidewalks and roofs
What is a positive affect of storm drains?
What causes beach erosion?
wind and water
when sand is washed away from the shore
How do humans affect beach erosion?
by building close to water they remove sand
How can we fix beach erosion?
1) by building further away from water, 2) revegetate dunes, 3) create sea walls, 4) add sand