Question

1. why did the compass become such a valuable tool for early european explorers?

a. it helped determine direction when sailing at sea
b. it predicted bad weather before journeys began
c. it calculated the length of trade routes and trips
d. it marked treaty zones claimed by rival nations

Explanation:

The compass is a tool that uses the Earth's magnetic field to show direction (north - south). Early European explorers who were sailing at sea needed a way to know their direction, especially when there were no visible landmarks (like on open ocean). Option b is incorrect because a compass doesn't predict weather. Option c is incorrect as a compass can't calculate the length of routes or trips (that would be something like a map with distance scales or mathematical calculations). Option d is incorrect because a compass doesn't mark treaty zones or claim areas; that would be related to political or legal documents and agreements, not a compass's function.

Answer:

a. It helped determine direction when sailing at sea