7. The earth's most important nonrenewable energy source is

A natural gas

OB oil

C the sun

OD coal

The reduction of consumption and production in Western Europe will most likely be accomplished by

Why are floods in urban areas particularly dangerous? 1. City buildings do not allow flood waters to recede. 2. Flood waters spread pollutants and diseases more rapidly. 3. Flood waters permanently damage crop soils. 4.

Briefly describe how the intensity and duration of solar radiation change at your location throughout the year.

What makes studying the beginnings of plate tectonics difficult? -The equipment needed has not been invented. -Plate tectonics began when the Earth formed. -Radioactive isotopes are difficult to study. -Rocks that old are hard to find.

Describe how the trash from the West Coast of the US ends up in the middle of the Pacific Ocean.

When a capital city is spatially associated with its core region, it is called a

Write the number 100,000 more than 123,045,067

How long would it take to circumnavigate the globe 1,273 times

List in order of relative size, from smallest to largest. Sun Jupiter Milky Way Universe Our Solar System

The four main systems of the Earth are