Which statement best explains why it can be difficult to identify a problem?
A.
A problem can be simple or complicated.
B.
A problem can be personal or emotional.
C.
A problem can be large or small.
D.
A problem can affect people or places.

What's erosion? a. the breakdown of rock into smaller pieces b. the removal of weathered products from rock c. a change in rock resulting from exposure to water d. a chemical change in rock that weakens it

Solve for r in the formula v = ir, when i = 5 and v = 15.

1. crust 1 the metallic layer at the earth's center 2. inner core 3 the firm layer between the crust and the asthenosphere 3. lower mantle 2 the layer surrounding the inner core 4. asthenosphere 4 the semi-solid layer between the top layer and the upper mantle 5. upper mantle 5 the layer between the asthenosphere and lower mantle 6. top layer 6 the earth's outermost layer 7. outer core 7 the hottest part of the mantle