Anita Ganeri's Forest Fire! (Nature's Fury - Britannica Digital Learning) PDF

By Anita Ganeri

Age variety: nine - 12 Years.

Table of Contents

What Is a woodland fireplace? 4
What Is a hearth? 6
How woodland Fires begin 8
Human-made wooded area Fires 10
How wooded area Fires unfold 12
Types of woodland fireplace 14
Fire and the panorama 16
Forest restoration 18
Forest Fires and folks 20
Fighting wooded area Fires 22
Firefighting gear 24
Fire Warnings and defense 26
Preventing wooded area Fires 28
Ten of the Deadliest woodland Fires 30
Glossary 30
Further details 31
Index 32

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Additional resources for Forest Fire! (Nature's Fury - Britannica Digital Learning)

Example text

In a nonreproductive male, the testes appear as two small fingerlike structures in approximately the same area as the ovary in females. In a sexually mature male they are greatly enlarged and, like the mature ovary, may take up much of the body cavity. In a breeding male, a white liquid known as milt will probably pass out of the vent at the time of the ventral incision. This is a secretion of the walls of the sperm ducts, which contains and nourishes the sperm cells. The liver is the color of beef liver and is located anterior and ventral to the stomach (fig.

The section “Anatomy and Physiology of Freshwater Fishes”explains these relationships in more detail. Thermal and oxygen stratification disappear in late fall as lower solar input and greater reradiation to the atmosphere combine to cool the epilimnion. The change in density due to surface cooling produces eddy currents, which aid in carrying the surface water downward. At 4 degrees C (39 degrees F) the water completely mixes throughout the lake. Ice forms only at the surface because of added cooling from subfreezing air and surface evaporation.

In contrast, the physoclystic swim bladder appears as a silvery white roof on the body cavity and is not connected to the esophagus. Instead, a complex bed of capillaries, known as the rete mirabile, or gas gland, employs a countercurrent system to secrete gases from the blood (O2, N2, and CO2) into the bladder. In a reverse manner, excess gases are reabsorbed by another vascular bed, the oval, in the posterior portion of the bladder. This system enables deep-water or pelagic fishes to adjust their buoyancy at different depths without coming to the surface.

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