What empire 500 years ago had no real concept of money? what was the unit of value in this empire?

You observe three different star clusters and find that the main-sequence turnoff stars in Cluster 1 have spectral type F, the main-sequence turnoff stars in Cluster 2 have spectral type A, and the main-sequence turnoff stars in Cluster 3 have

Which factors led to the Dust Bowl of the 1930s?

What countries produce acid rain or cause it

Where do most of mexico's people live today

Briefly explain how physical weathering enhances the rate (speed) of chemical weathering?

Which is an example of kinetic energy? A) a ball rolling across the floor B) the energy stored in gasoline C) a stretched spring D) a book sitting at the top of a bookshelf

Read the passage below and answer the question that follows. William has been living in a highly populated region in Eastern Europe for five years.

What is the definition of Taphonomy?

Which part of africa is dominated by congo river

What is an ecosystem?