Which Old World crop introduced by the Spanish most dramatically increased demand for African slaves in the Caribbean?

a. Wheat

b. Indigo

c. Sugar

d. Rice

2. What is the first event that happens to a star with roughly the mass of our Sun that exhausts the hydrogen in its core and stops the generation of energy by the nuclear fusion of hydrogen to helium?

If you travelled from 45° North directly south to 7° South, how many miles would you have travelled? 1.3,588 miles 2.5700 miles 3.2655 miles 4.278 miles 5. none of the above

How do you think scientists are able to study the center of the earth

What makes an iceberg dangerous? a. Decisions are made based on what you can see b. It is challenging to know the iceberg's exact shape and size c. You can't confront an iceberg without facing the facts and using the numbers to navigate d.

An astronaut awakes in her closed capsule, which actu - ally sits on the Moon. Can she tell whether her weight is the result of gravitation or of accelerated motion? Explain.

Why did the Mongols launch the deadly attack on Nishapur

Which latin American country is the only nation ever created as a result of a revolt by enslaved people? A. Brazil B. Chile C. Haiti D. Aragentina

Where did the big bang occur? where did the big bang occur? near the center of the milky way galaxy. near the andromeda galaxy. several billion light-years away. near the earth. throughout all space?

Convection currents in the plastic mantle are believed to cause divergence of lithospheric plates at the

Which movement is completed in a 24 hour time period? A the moon completing a revolution around Earth B the outer planets orbiting the sun C Earth completing a revolution around the sun D Earth completing a rotation on its axis