What evidence tells us that Earth has a distinct concentration of high-density material near the center and does not gradually transition from low-density to high-density rock?
What will be an ideal response?
The wobble of Earth's rotation axis is consistent with a distinct concentration of high-density material near the center.
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For the purpose of gathering comparable data, the United Nations has imposed a precise definition of the meaning of urban upon the world's states
Indicate whether this statement is true or false.
What is plankton?
a. Any photosynthetic organism b. An internal organism c. A drifting organism d. Microscopic organism
About half of urban sprawl is due to ________
A) highway/road expansion B) less people living in cities C) an increase in urban population D) residential development E) increased per capita land use in urban areas
Imagine a profile of soil going to a depth of approximately 10 ft. On a sunny day, the soil at a depth of 5ft will be ________ the soil at the surface because ________
A) warmer; soil is a good conductor of heat B) cooler; plate movement mixes the soils and dissipates the heat C) warmer; geothermal processes heat the deeper soils D) cooler; land is opaque preventing heating at depths E) cooler; convective heating will warm the subsurface more than the surface