Which of the following represent human systems?

1. Cascade Tunnel

2. coal mines

3. Rocky Mountains

4. the Erie Canal

5. Lake Superior

Which statements describe an element? Check all that apply. An element is a pure substance. An element is made of only one type of atom. An element is made of two or more different types of atoms. An element can be broken down into a simpler form.

You are swimming in the shallow waters along a beach and you notice that your belongings that were sitting on the beach right in front of you are now further down the beach. What type of current has caused you to move

Best way to explain scientific observations

What evidence did Ottawa scientists collect in researching PCB concentrations in Alaska?

What might you look for in a indicator species

What is often a difference between the hearths of folk culture and those of popular culture

Why did the Mongols launch the deadly attack on Nishapur

Which latin American country is the only nation ever created as a result of a revolt by enslaved people? A. Brazil B. Chile C. Haiti D. Aragentina

Where did the big bang occur? where did the big bang occur? near the center of the milky way galaxy. near the andromeda galaxy. several billion light-years away. near the earth. throughout all space?

Convection currents in the plastic mantle are believed to cause divergence of lithospheric plates at the