What is a symbol a. a specific icon used to indicate a feature such as rocks b. a specific icon used to indicate a feature such as letters c. a table defining the colors letters and keys such as rocks d. a table defining the colors letters and keys such as letters

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 measure of humidity, relative humidity or dew point, best describes the actual quantity of water vapor in a mass of air

Irelanda. populationb. square mileagec. average population density per square mile