Answer:
1. hydrogen Nitrogen Lead Mercury
2. Phytoplankton
3. About 71 percent of the Earth's surface is water-covered, and the oceans hold about 96.5 percent of all Earth's water. Water also exists in the air as water vapor, in rivers and lakes, in icecaps and glaciers, in the ground as soil moisture and in aquifers, and even in you and your dog.
Explanation:
Did you know that more than half of the oxygen on earth is produced by these tiny one-celled plants in the surface of the ocean called phytoplankton?
hope this help
Answer:
Human population changes due to population dynamics as birth, death and migration.
Explanation:
- The shift in the population of the US occurring during the year 2000 to 2004 as a result of the movement from the northeast, midwestern regions to the north and south west and to the southeast.
- Places like California and NY were losing population due to the high cost of living. States like Michigan had high unemployment rates. Other states gained population due to the lower living costs and availability of jobs.
The 5 famous mountain ranges in South America include The Andes, The Sierra Nevada de Santa Marta, Sierra de Cordoba, The Wilhelmina Mountains, and The Mantiqueria Mountains.
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a) False ( Because covers a about 2% )
b) False ( Because between Africa and Asia)
c) False (Baltic Shield is known as Fennoscandian Shield )
d) True
e) True ( Not sure because ,It could be a false because is the busiest river of Europe is River The Rain , but It could be true because it is navigable )
I hope I helped you^_^
