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Which of the following is the most abundant metal on Earth’s crust?
In mountainous areas a natural cause for road blocks is often
The moon is showing its same face to the earth because:
Which one of the following is an abiotic and renewable resource?
Smog is a combination of:
Grassland ecosystem has which type of biomass pyramid?
Tundra’s are:
When does the sun shine vertically on the Equator?
Spring tides occur on:
Marble is the metamorphosed form of: