The Sandy River, Snake River, and Willamette River are a few
Answer:
The answer is seriation.
Explanation:
Seriation is a process which involves the arrangement of a series of objects following a hierarchical order. An example would be organizing objects by size or alphabetical order.
According to psychologist Jean Piaget, this process is acquired by children in their <u>concrete operational stage</u>, and it's important for understanding abstract concepts such as mathematics and time.
These lines are called cross-contour lines.
Cross-contour lines are used in making nice pieces of art but most importantly they are a huge helping tool. These cross-contour lines can help people understand the solid form and the appearance of object from different perspectives and vantage points. Thus they are invaluable learning tool.
A is the correct answer choice
