The New book of knowledge, Volum 11An illustrated encyclopedia containing over 9,000 articles on history, literature, art and music, geography, myths and legends, mathematics, science, hobbies, holidays and festivals, games, sports, crafts, medicine, law, government, industry, politics, and other topics. |
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Side 16
As streams flow over the land surface, they take out some of its minerals. The one
that comes out most easily is salt (sodium chloride). Streams also pick up
compounds of magnesium, calcium, and potassium. When water from the land
finally ...
As streams flow over the land surface, they take out some of its minerals. The one
that comes out most easily is salt (sodium chloride). Streams also pick up
compounds of magnesium, calcium, and potassium. When water from the land
finally ...
Side 23
In the Devonian period, the first large land plants appeared. Forests of fern trees
and other plants covered the lowlands. Some trees had trunks nearly a meter (3
feet) in diameter. The first land vertebrates, related to lungfish, appeared late in ...
In the Devonian period, the first large land plants appeared. Forests of fern trees
and other plants covered the lowlands. Some trees had trunks nearly a meter (3
feet) in diameter. The first land vertebrates, related to lungfish, appeared late in ...
Side 24
The fossil corals tell us that lands, seas, and climates have changed since the
Permian period. Near the end of Paleozoic time, the ... The climate was rather
mild during this time. There were many plants and animals on land and in the sea
, but ...
The fossil corals tell us that lands, seas, and climates have changed since the
Permian period. Near the end of Paleozoic time, the ... The climate was rather
mild during this time. There were many plants and animals on land and in the sea
, but ...
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