What physical factors and positions or movements of the earth cause different amounts of energy to strike the surface of the earth? ( )

1. The position of the earth (The Earth is tilted about 23 degrees so as it goes around the sun light strikes the planet's northern hemisphere more directly in summer than in winter.)

2. Gravity

3. Friction

4. Radiation

Just some thoughts

indium, and thallium have three electrons i think

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.