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Human Dependence on Oceans

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by

Natosha Daniels

on 10 December 2014

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Transcript of Human Dependence on Oceans

Human Dependence and Impact on Oceans
8.11D Recognize human dependence on ocean systems and explain how human activities such as runoff, artificial reefs, or use of resources have modified these systems
Humans depend on the ocean for many reasons including
food, transportation, energy sources, and recreation.

The use of resources from the world’s oceans has had a major impact on the biodiversity in these ecosystems.

Human activities play an important role in changing the environment of the oceans
How Do We Depend on Oceans?
Runoff
Runoff is the flow of water that occurs when the
soil is saturated
and
excess water
from rain, or other sources, flows over the land and can accumulate in
rivers, lakes, and oceans
.
Can pick up Pollution along the way
List Ways Humans Depend on Oceans Here
Negative Impact
Help!
Positive Impact
The more houses and roads we build creates
impermeable
surfaces (such as concrete and pavement) that do not allow
percolation (filtering)
of water down through the soil and into the
aquife
r (where groundwater is stored).

Instead, water is forced directly into the water source such as a river, lake, or ocean, usually carrying pollutants with it.


http://www.edwardsaquifer.net/barton.html
(skip to 2:00)
Artificial Reefs
Artificial reefs are man-made underwater structures built to promote marine life in areas that typically have a flat, featureless bottom.
They can be intentional by placing unused or non-working structures that were once used for other purposes such as old automobiles, buses, train cars, and oil rigs down to the ocean floor.
Algae and invertebrates such as coral, oysters, and barnacles can attach tthe Reefs. As they grow, reefs provide a structure for habitats and food
These concerns include toxicity of some man-made structures, damage to natural ecosystems, and even worsening the effects of overfishing by accumulating fish into one area.
The Majestic Plastic Bag
Brain Break
Artificial reefs can also occur unintentionally such as a ship that sinks during a shipwreck.
Full transcript