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Earth Science 101 Practice Test: Ocean Water and Ocean Life
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Avg score: 34% • Most missed: “Open ocean of any depth where animals swim or float freely is known as the _____…”
Earth Science 101 Practice Test: Ocean Water and Ocean Life
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25 Questions

1. The amount of carbon fixed by organisms through the synthesis of organic matter using energy derived from solar radiation is called ________.
2. Organisms, such as algae and bacteria, that drift with ocean currents are known as ________.
3. The total amount of solid material dissolved in water is known as ________.
4. Animals capable of moving independently of the ocean currents, by swimming or other means of propulsion, are called ________.
5. Salinity in the ocean is highest in regions where ________ is high and ________ is low.
6. Open ocean of any depth where animals swim or float freely is known as the ________ zone.
7. The most abundant salt in seawater is ________.
8. The dissolved materials in seawater are thought to originate from chemical weathering of rocks on the continents and also from ________.
9. Thermoclines in the ocean are best developed at ________.
10. In the food chain, each feeding stage is called a ________ level.
11. The area where the land and ocean meet and overlap is called the ________ zone.
12. Most marine animals live near the surface of the ocean because of ________, which supports photosynthesis by marine algae that form the basis of the food chain.
13. A rapid change in density with depth in the ocean is called the ________.
14. The mass of all living organisms on Earth is called the ________.
15. Technically, algae are called ________.
16. The speed of sound in the ocean has been measured to determine changes in ________ of the ocean.
17. The ________ zone is the near-surface zone of the ocean where light is strong enough for photosynthesis to occur.
18. The proportion of dissolved substances in seawater is expressed as 0/00, which is the same as ________.
19. Productivity is highest in ________.
20. ________ organisms live on or in the ocean bottom.
21. Productivity in temperate oceans is determined by ________.
22. The upper part of the ocean into which sunlight penetrates is called the ________ zone.
23. Seaward of the low tide line is called the ________ zone.
24. Density in seawater is determined by ________.
25. A rapid change in temperature with depth in the ocean is called the ________.

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