What is the name for galaxies held together by gravity? A. solar system B. constellation C. binary system D. cluster

Why are floods in urban areas particularly dangerous? A. city buildings do not allow flood waters to recede B. pollutants and diseases are spread by flood waters more rapidly C. crop soils are permanently damaged D.

What is the difference between a river basin and a watershed

If you wanted to follow the longest river and hike upstream, which direction would you head?

Which of these statements best describes a similarity between weathering and combustion? Both increase the level of carbon in the biosphere both reduce the level of carbon in the biosphere both transfer carbon from the atmosphere to the geosphere

The four main systems of the Earth are

What force acts again capillary action as water moves through the ground

According the hardy-Weinberg principle which of the follow is most likely to disrupt genetic equilibrium

What is the impact of county government on the lives of citizens

How does earths orbit affect our climate

Describe some of the challenges facing farms and cities in China as a result of urbanization