Natural sources of air pollution include ___. *

internal combustion engines

coal-fired electrical plants

soil dust, wildfires, and volcanic dust

evaporation of solvents

If a block of wood has a mass of 36 grams and a volume of 9 cm3, what is its density? g/cm3 1. 2. 3.

Cementation often occurs directly after erosion weathering deposion

Explain the role of water potential in the movement of water from soil

How much does 51 ml equal in cm3

If a cell is too large to fit through the membrane how does the cell solve this problem

Why does a block of metal sink in water but the same size block of wood float? The molecules in the metal are closer together than the molecules of the wood. The metal is more compact.

Do eukaryotic have membrane-bound organelles?

Your chances of developing breast cancer dramatically increase with age. at what age do doctors recommend getting a yearly mammogram?

A mineral can be scratched by calcite but not by a fingernail. what is its approximate hardness?

Why are some biology questions still unanswered?