The circle of illumination divides Earth into two hemispheres known as ____
a. longitude and latitude
b. east and west
c. summer and winter
d. day and night
e. north and south
d
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Boundaries that separate individual strata from one another are called ____________________. Fill in the blank(s) with the appropriate word(s)
Which of the following is true of the prime meridian?
A) It is used to determine latitude using lines that run east and west. B) It was first used in the 1500s at the time of initial circumnavigation voyages. C) It was not established until 1884 and is centered on an observatory near London. D) It is that place on Earth where the days officially change.
Which of the following approaches would be the least beneficial in trying to reduce insect damage?
a. rotating crops b. genetic engineering of crops c. planting monocultures d. bringing in natural enemies e. planting polycultures
The sunspots produce huge ejections of particles that:
A) accelerate the melting of ice sheets. B) produce auroras in Earth's atmosphere. C) rapidly increase the temperature at the surface of Earth. D) do not generally interact with the Earth system.