What original idea was modified once Columbus discovered he did not land in India?

He originally though that the Earth is small, but later realized it was bigger.
He originally thought the world was flat, but later realized that it was round.
He originally though the Sun revolved around Earth, but later realized it did not.
He originally thought that Earth stood still in the center of the universe.

Which of the following statements is true? a. there is not enough food produced in the world to feed everyone. b. the biggest cause of hunger and malnutrition is the cost of getting food to people who need it most. c. most countries have enough arable land and resources to feed their own population and export a surplus d. malnourishment is only seen in a few countries with very limited food supplies.

Which occurs when air is compressed? air molecules move slower. air temperature rises and air molecules move faster. air temperature decreases. air temperature decreases and air molecules move faster.

Ateam of researchers calculates that a glacier will melt completely away in the next 100 years. which land structure will most likely be left behind after the glacier melts?