Card Set Information
5th grade science
What is the process of the breaking down of rocks into smaller pieces?
What is the mechanical breakdown of rock?
What are four causes of physical weathering?
What is it called when oxygen in the air reacts with certain deposits in rocks and minerals, weakening, and causing them to crumble?
What is rain that has come in contact with contaminants such as industrial exhausts and becomes acidic?
the process by which weathered materials are carried away
when something curves or bends in a streambed formed by slow moving water on gently sloping land
a broad, flat area surrounding a streambed that is close enough in elevation to the streambed so that occasional flooding occurs
soil, sand, rock , and anything else suspended in the water
What is formed when a stream reaheds its base level?
the level at which the stream enters a lake or ocean
similar to a delta, but is formed upstream when deep, fast-moving waters enter a shallow, wide area and deposits its sediment in the streambed
the process in which particles settle to the bottom of a liquid
a small bit of material
water that neither gets absorbed by the earth nor evaporates
periodic changes in the surface level of the oceans - caused by the moon's gravitional pull
artificial barriers constructed along the shoreline to absorb or deflect energy of the breaking waves, therefore reducing the amount of the erosion
an earth material that allows water to pass through it is...
an earth material that has all its air pockets/space filled with water is....
Where do waves get their energy?
From the wind blowing across the surface of the water
What factors affect the size and strength of waves?
speed of the wind
direction of the wind
hi or low tide
How does temperature affect rocks and minerals?
Extreme changes in daytime and nighttime temperatures can cause rocks to crack
: a rock in the Sahara desert
How does water weather rocks and minerals?
Water seeps into rocks' cracks, freezes, expands, causing the crack to get bigger and eventually break into smaller pieces
: a waterfall
How does vegetation weather rocks and minerals?
Roots of plants can grow in the cracks of rocks
: moss, lichens growing on a rock
How does wind weather rocks and minerals?
The force of the wind pushes against the rock, and sand and soil blown onto the rock wears it away
Which settled slowest to fastest?
(gravel, soil, sand)
Gravel - slowest
Sand - middle
Clay soil - fastest
Why did each material settle at its speed?
The heavier the substance, the faster it deposits