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1. C 2. B 3. A 4. D In that order
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I believe that it is Oxygen and silicone
Earthquakes produce three types of seismic waves: primary waves, secondary waves, and surface waves. Each type moves through materials differently. In addition, the waves can reflect, or bounce, off boundaries between different layers.
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anguage
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Russia, the world's largest country (by total area), comprises much of northern Eurasia, and stretches over a vast expanse of Europe and Northern Asia.[1] Due to its size, Russia displays both monotony and diversity. As with its topography, its climates, vegetation, and soils span vast distances.[2] From north to south the East European Plain is clad sequentially in tundra, coniferous forest (taiga), mixed and broadleaf forests, grassland (steppe), and semi-desert (fringing the Caspian Sea) as the changes in vegetation reflect the changes in climate. Siberia supports a similar sequence but is predominantly taiga. The country contains forty UNESCO biosphere reserves
