What did Polynesians use to determine if an island was near, but could not be seen yet?
A) The change in the rhythmic set of waves against the hull
B) The Flight tracks of birds at dusk
C) The Smell of the water
D) All of these choices were used
D
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Persistent pollutants tend to accumulate in polar regions because
A. they are more stable at lower temperatures. B. ionic effects move them toward the poles. C. they evaporate in warm areas and condense in cold areas. D. there are no crops to absorb them there.
The rise of mountains has been linked to global climate change.
Answer the following statement true (T) or false (F)
Assessing the proportion of children under the age of five who are underweight is one way that the United Nations can assess progress made in the battle against
A) hunger. B) distribution of food. C) the underproduction of food. D) global climate change.
Lithospheric plates are the tops of convection cells and subduction zones are the downgoing part of the convection cell
Indicate whether the statement is true or false