Answer to Question 1
In 1976 the EPA began regulating lead emitted from automobiles, particularly after it was found to deactivate the catalysts in automobile catalytic converters. All automobiles manufactured after 1975 had to have a catalytic converter installed in order to help reduce the emissions of carbon monoxide, hydrocarbons, and nitrogen oxides. Since 1980, the use of leaded gasoline has now been banned in most countries, and global emissions of lead have decreased by 90 since 1970.
Answer to Question 2
Chemical differentiation of the hot, molten, early Earth. The densest material sank to the interior (bottom) of Earth, and the lightest material floated to the top.
An example of sodium balance achieved by the coordinated actions of three hormones.
Lead leaching from electronic waste (e-waste)
Fossil fuel emissions and climate change
A close relationship between greenhouse gas emissions and a country’s gross domestic product
Land use change and forestry are responsible for 18% of global greenhouse gas emissions
An automobile engine provides 524 Joules of work to push the pistons and generates 2160 Joules ...