Which description of soil likely allowed Darren to make this identification? Mostly large particles, with a gritty texture, 60% sand, 10% clay, and 30% silt Mostly large particles with a smooth texture 40% sand 50% clay, and 10% silt Mostly small particles with a smooth texture 10% sand 50% clay and 40% silt O Mostly small particles, with a smooth texture, 30% sand, 30% clay and 40% silt

1. crust 1 the metallic layer at the earth's center 2. inner core 3 the firm layer between the crust and the asthenosphere 3. lower mantle 2 the layer surrounding the inner core 4. asthenosphere 4 the semi-solid layer between the top layer and the upper mantle 5. upper mantle 5 the layer between the asthenosphere and lower mantle 6. top layer 6 the earth's outermost layer 7. outer core 7 the hottest part of the mantle

Which of the following types of nonrenewable fuel sources requires the storage of radioactive waste? a. coal b. nuclear c. solar d. oil

Select an environmental issue faced by the countries of this region ( central america, south america, and the caribbean) . write a 150-word essay describing the problems presented by each issue and possible solutions to these problems.