1 / 11

Earth’s Oceans Part I

Earth’s Oceans Part I. Source: CK12.org Earth Science Chapter 14 Author: Robert G. Smith. Significance of the Oceans. oceans, along with the atmosphere, keep temperatures fairly constant worldwide Earth: -70 to 55 Celsius Mercury: -180 to 430 Celsius

aliza
Télécharger la présentation

Earth’s Oceans Part I

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Earth’s Oceans Part I Source: CK12.org Earth Science Chapter 14 Author: Robert G. Smith

  2. Significance of the Oceans • oceans, along with the atmosphere, keep temperatures fairly constant worldwide • Earth: -70 to 55 Celsius • Mercury: -180 to 430 Celsius • Earth temperature is moderated by water takes a long time to heat up or cool down

  3. Tallest and deepest • Earth’s tallest mountain isMauna Kea volcano, which rises 10,203 m • Deepest canyon is also on the ocean floor, the Challenger Deep in the MarianasTrench, 10,916 m

  4. Marine Life • Marine life makes up the majorityof all biomass on Earth. • Biomass is the total mass of living organisms in a given area.

  5. Salinity • Salts comprise about 3.5% of the mass of ocean water, but the salt content or salinity isdifferent in different locations • Dead Sea has 30% salinity—nearly nine times the averagesalinity of ocean water

  6. Composition • Water density increases as: • salinity increases • temperature decreases • pressure increases The average depth of the ocean is 3,790 m • three major factors that makethe deep ocean hard to inhabit are the absence of light, low temperature, and extremely high pressure

  7. Vertical Water Divisions - Photic • scientists define the water column by depth • Sunlight only penetrates the sea surface to a depth of about 200 m, creating the photic zone • Organisms that photosynthesize depend on sunlight for food and so are restricted to the photic zone

  8. Vertical Water Divisions - Aphotic Zone • aphotic zone there is not enough light for photosynthesis • makes up the majority ofthe ocean, but has a relatively small amount of its life, both in diversity of type and in numbers

  9. Horizontal Ocean Divisions • Nearest to the shore lies the intertidal (littoral) zone, the region between the high and low tidal marks • Neritic zone is from low tide mark and slopes gradually downward to the edge of the seaward side of thecontinental shelf • Oceanic zone is the entire rest of the ocean from the bottom edge of the neritic zone, where sunlight doesnot reach the bottom

  10. Ocean Zones - Graphical

  11. Vocabulary Review • aphotic zone • biomass • intertidal zone • neritic zone • oceanic zone • photic zone • salinity • water column

More Related