Science--Chapter 12: Earth's Oceans (Lesson 1)
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6 terms
Terms | Definitions |
|---|---|
 What causes the saltiness of ocean water? | The saltiness of ocean water comes from minerals that are washed from the land. Water evaporates from the surface of the ocean, but the salt is left behind. |
| What is the main mineral in ocean water? | The main mineral in ocean water is sodium chloride, table salt. |
| What are 3 details that describe conditions deep in the ocean? | 1) temperature is cold 2) darkness--no light 3) water pressure increases |
| What are 3 main ways islands in the ocean can change? | 1) they can form/grow (building up layers of lava from erupting volcanoes) 2) they can get smaller (ocean waves can wear away the rock) 3) they can sink |
| What is the continental shelf and how far does it extend? | The continental shelf is the part of the ocean floor that drops gently near the land. The continental shelf extends from the edge of the continent into the ocean. The average depth is about 460 feet. The average width ranges from 1 mile to 750 miles. |
| What are 3 features found on the abyssal plain? | 1) trenches 2) mountains 3) mid-ocean ridges |
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