How many years does it take a star with the mass of the sun to covert all the hydrogen in its core

True or False?: A protostellar cloud spins faster as it contracts, even though its angular momentum stays the same. a) True, angular momentum is conserved and if the cloud contracts, it must spin faster.

Why is the youngest oceanic crust found at the mid ocean ridge and the oldest crust found at the trenches?**?

During which dynasty was China first united?

Where does most of the nitrogen cycle take place

A relief map shows human-created features such as cities and boundaries true false

Why is Dubai creating underwater resorts and reclaimed islands? Dubai has an incredible amount of money to spend on building projects. Dubai's population is growing at a very fast pace, some say too fast.

Where was the maya civilization located

The widespread presence of banana plantations in central america region has resulted in increased standard of living

Which of these has been the result of human activity? a) glaciers melt more b) volcanoes erupt more landslides happen more d) earthquakes happen more

Which types of stars have extremely intense gravitational and magnetic fields?