What issues present the most pressing problems for the U. S.?

aging population

increasing energy costs

lack of natural resources

lack of skilled labor

Why do pollution and smog often become trapped in Los Angeles and other similar urban areas? a. The combination of temperature inversions (because of being surrounded by mountains) and extended periods of sunlight result in the buildup of smog in

Which of the following locations will most likely have the highest average annual precipitation? South Pole Sahara Desert Juneau, Alaska Amazon Rainforest

What is interdependence? Question 5 options: Countries thrive with policies that promote isolation. Countries must depend on other nations to provide some needs. Countries are able to be self-sufficient with a little practice.

The "rock cycle." It indicates (the book's diagram) that sedimentary rocks turn into metamorphic rocks, which in turn change into igneous rocks, which are then eroded to make sedimentary rocks.

Due to their location in the Andes which civilization built many roads and bridges to stay connected? A) Aztec B) Inca C) Mayan D) Olmec

Trees in deciduous forest do what? A. Shed leaves during one season B. Grow in a warm Mediterranean climate C. Have needlelike leaves D. Grow in a climate that is cold year round

How many miles long is the great wall of china

What landforms are created at convergent boundaries?

In which direction does the Sun appear to move across the sky? Ofrom west to east from east to west from north to south from south to north

What is a planetary nebula neither a planet nor a nebula?