,, and control weather and climate. Sunlight strikes the ground at higher latitudes.

is the passing of energy from one body to another through direct contact.

The earth radiates energy in the form of rays.​

“obamacare”: included a provision for government-run health insurance called “the public option.” was bitterly opposed by congressional republicans because most favored a “single-payer” plan. survived two challenges to its constitutionality. was partially repealed in 2013 in order to avert a government shutdown. led to the expansion of medicaid in republican controlled states.