Question

a form of labor in which a person voluntarily signs a contract to work without pay for a specific number of years in exchange for free travel to the new world.
northwest passage
middle passage
slavery
indentured servitude
a special instrument that explorers began using to navigate at sea in the 1400s by measuring positions of the sun and other objects in the sky.
astrolabe
caravel
magnetic compass
mercator projection
a device that is used to find direction by means of a needle that always points north.

Explanation:

1. Indentured servitude involved people signing contracts to work without pay for a set number of years in exchange for things like free travel to the New World. It was a form of labor - not a sea - route like the Northwest or Middle Passage, and it was different from slavery as it was a voluntary (though often out of necessity) contract for a limited time.
2. The astrolabe was an instrument used by explorers in the 1400s to navigate at sea by measuring the positions of the Sun and other celestial objects. A caravel was a type of ship, a magnetic compass was used to find direction based on the Earth's magnetic field, and the Mercator projection was a map - making technique.

Answer:

1. D. Indentured Servitude
2. A. Astrolabe