By Pam Walker
ISBN-10: 0816057044
ISBN-13: 9780816057047
It's only common for individuals to be desirous about the ocean. existence originated within the oceans, and greater than one-half of the folk in the world stay inside 50 miles of the ocean. in spite of the fact that, although we have now despatched explorers to the moon and different areas of area, we nonetheless be aware of little concerning the frontier that surrounds us. The attractive new "Life within the Sea" set presents younger readers with present, obtainable information regarding the ocean and its creatures. This entire source at the ocean's population provides residing issues of their actual habitats, emphasizing the connection among marine biology and marine ecology. each one quantity specializes in one particular zone of the marine global, discussing its actual features, the dwelling issues stumbled on there, and the impression people have at the region. the suitable spouse to "Facts On File's lifestyles in the world" set (see dealing with page), this precious reference provides a well-rounded view of marine lifestyles.
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Extra resources for The Continental Shelf (Life in the Sea)
Example text
35 Marine plants fall into two major types: macroscopic algae and vascular plants. Macroscopic algae, or seaweeds, are multicellular autotrophs with unique adaptations for their marine habitats. Seaweeds are classified as green, red, and brown, depending on the pigments they contain. Vascular plants, another group of multicellular autotrophs, include several types of sea grasses. Green Algae Green algae are closely related to terrestrial plants because they share the same major pigments, chlorophyll a, chlorophyll b, and carotenoids.
44 T The ontinental Shelf Fig. 2 A diver inspects a large vase sponge on the continental shelf. (Courtesy of OAR/National Undersea Research Program [NURP], NOAA) deeper water, they take on shapes of barrels, vases, shelves, flowers, or branching plants. In the photo, a diver swims close to a large vase sponge. Because sponges are animals, and do not require light, they can form dense colonies in areas of the continental shelf where light levels are too low to support algae and the competition for space is not as strong.
These extremes are known as spring tides and occur every two weeks. During first- and third-quarter conditions, when only one-half of the Moon is visible in the night sky, the Sun and Moon are at right angles to the Earth. In these positions, their gravitational pulls are working against each other, and the two bodies cancel each other’s effects to some degree, causing high tides to be at their lowest, and low tides to be at their highest. These neap tides also occur every two weeks. 13 14 T The ontinental Shelf density of the upper layer.
The Continental Shelf (Life in the Sea) by Pam Walker
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