earth matrial change Flashcards
why the moon does not change but the earth does ?
is because of the interactions of the 1geosphere,
2 hydrosphere, and 3 atmosphere through processes called weathering and erosion.
gave one example of earth’s surface changes.
grand Canyon
what grand canyon was before? and why it changed now ?
the Grand Canyon. Millions of years ago, it was at the bottom of the sea. Geologic forces uplifted the area and the sea retreated.
The Colorado River flowed over —————-
The Colorado River flowed over the soft sandstones and limestones.
Plate tectonic forces add new rocky material to the earth’s surface. what are they
rocks from volcanoes, mountain building, seafloor spreading
talk about the volcanios rocks
VolcanoeswIgneous rock material is spread by lava flows, pyroclastic explosions, ash, and dust.
talk about the mountain bulding rocks
Mountain buildingwContinental-continental convergence uplifts mountains and brings new material to the surface.
talk about the seafloor seprading
Seafloor spreadingwNew basalt layers are added to the seafloor.
what is subduction and when it usually happen ?
Subduction is the process where one plate sinks beneath another. It usually happens when seafloor portions of plates interact with each other (oceanic-oceanic convergence) and with continents (continental-oceanic convergence)
The rocks in the subducted plate get ———–, but eventually get changed and make it————–
The rocks in the subducted plate get((( removed from the surface))), but eventually get changed and make it((( back to the surface.)))
Once on the surface, these rocky materials can be changed and moved around by —————-
Once on the surface, these rocky materials can be changed and moved around by winds, water, and ice.
The rocks on the surface are exposed to a variety of moving fluids such as—-,The fluids break rocks into ——-. The—— then dissolve or become —— in the fluids,The motions of the fluids carry the —- from where they—– to other parts of the earth’s surface,,As the speed of the moving fluid ——, many pieces —— or get deposited in a new place. There, the pieces can ——-form new—-features or new types of ——for example,—————
The rocks on the surface are exposed to a variety of moving fluids such as
winds, water (rainfall, rivers, and streams), and ice (snowfall and glaciers)
The fluids break rocks into small pieces. The pieces then dissolve or become suspended in the fluids. The motions of the fluids carry the pieces from where they originated to other parts of the earth’s surface. As the speed of the moving fluid slows, many pieces fall out or get deposited in a new place. There, the pieces can build up to form new geologic features or new types of rockwfor example, sedimentary rock.
Air, water, and ice can break surface rocks into small pieces.
Air, water, and ice can break surface rocks into small pieces.
Take a piece of sandstone and place it in a clear plastic container of water. Let it stand for a while. What do you think will happen? Particles of sandstone will break off and dissolve in the water, and the water will look brown. The water breaks the sandstone into tiny pieces.
If you blow a steady stream of air across the sandstone, you will find that fine particles blow away. If you wet the sandstone, then freeze it, and later thaw it, you will find particles of sandstone in the melted water. Air, water, and ice can break rocks into tiny fragments in the process of weathering.
Fluids can move rock pieces from one place to another.
Fluids can move rock pieces from one place to another.
The Mississippi River is often called the Muddy Mississippi. The river is full of tiny rock fragments suspended in the water. As the river flows, it moves these rock particles downstream and into the Gulf of Mexico. Any flowing water will do the same, and the constant beating of waves along a shoreline can fragment rocks into sand.
Air can move rock particles. For example, dust storms can move massive amounts of rock particles over great distances. Glaciers can also move massive amounts of rocks miles from where they began.
The movement of weathered rock particles by air, water, or ice is erosion.
Moving fluids change the landscape.
Moving fluids change the landscape.
Because wind, water, and ice break down and move rock material, they change the landscape. As you have seen, erosion forms deep valleys and wears down mountains, but the sediment must go somewhere.When moving fluids slow down, they deposit rock fragments. For example, when a stream enters a lake or an ocean, the water loses its energy and drops the sediment it is carrying.
