How do you think Columbus was able to cross the ocean without wandering north or south by accident? Was he right about the shape and the size of the Earth? Did he realize that he had landed on a “new world”?

Which of the following was an economic reason for the united states to declare war on spain in 1898?

This is the mountain range known as the alps. which of these statements regarding the alps is true? a) the alps are the largest mountain range in asia. b) the alps protect the roman empire from invasion. c) the alps were key in preventing england from being conquered in warfare. d) the alps prevented the roman empire from taking control of most of europe.

An object weighs 40n in air , weighs 20n when submerged jn water and 30n submerged in a liquid of unknown density .what is the density of the liquid?