A stream carrying sediment flows over the solid rock of its channel, polishing the rock and wearing it away. This is an example of .

Complete the activity titled "comparative urban environments." every city is shaped by different cultural forces. in one to two paragraphs, contrast the culture of two different cities from this activity: new york and buenos aires. what makes these cities stand apart from each other culturally? what is unique about each city’s attitude, language, habits, foods, or architecture?

In the following diagram, four different index fossils are labeled: which of the labeled fossils comes from the oldest organism? a b c d

How are the arctic and antarctic circles alike?