Today’s Agenda… 1-20 Bellringer Questions on Review Sheet Notes on Oceans

Ocean Water Study pack #7

Today’s Goals… I can state the importance of Earth’s oceans. I can discuss the origin of oceans. I can describe the composition of seawater. I ca explain how temperature and pressure vary with depth.

True or False?? Oceans are used to ship materials around the world. Most of the oxygen on Earth comes from ocean organisms. Ancient volcanoes caused the creation of oceans. There is no oxygen in ocean water As you go deeper in the ocean, temperature increases.

Importance of Oceans Provide a place for organisms to live Transport seeds and animals across the world Allow materials to be shipped around the world

Importance of Oceans Provide us with resources like food, medicine, and salt The water for most of our precipitation comes from evaporation of oceans 70% of oxygen on Earth is given off by ocean organisms

Formation of Oceans As ancient volcanoes erupted they released water vapor into the atmosphere When the water vapor cooled enough it formed clouds and then precipitation Water collected in low areas and formed oceans

Composition of Ocean Water Rivers and groundwater dissolve materials from rocks and carry them to the oceans Erupting volcanoes add other materials Most abundant elements are sodium and chloride (salt)

The Dead Sea

The Dead Sea

The Dead Sea

Dissolved Gases All of the gases in Earth’s atmosphere are also dissolved in ocean water Oxygen, carbon dioxide, nitrogen Organisms in the water also produces gases like oxygen through photosynthesis Organisms that carry on photosynthesis live near the top to get sunlight

Water Temperature and Pressure The surface layer is warm because it receives the most solar radiation Temperature decreases as you go deeper Pressure also increases as you go deeper

True or False?? Oceans are used to ship materials around the world. Most of the oxygen on Earth comes from ocean organisms. Ancient volcanoes caused the creation of oceans. There is no oxygen in ocean water As you go deeper in the ocean, temperature increases.