D. Hydrogen
Two elements make up the overwhelming majority of the sun's matter, by mass: hydrogen (about 70 percent) and helium (about 28 percent).
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The density of air in a limited amount of space.
<span>B.
Lava, ash, and other materials from volcanic eruptions gradually build up over time. This is the correct answer. The volcanic molten material is ejected from fissures or initial cones and as the lava flows out and cools and as the pyroclastic materials solidify and tumble down the slopes, they build up the flanks of the volcanoes.</span>
The answer is a pampas that is not a savanna
