Amending the articles of confederation required states to approve of the amendment.

9 out of 13 or two-third

Explanation:

For amending the Articles of Confederation, the first constitution of the United States, a unanimous approval was required. A unanimous approval means that at least two-third of the states approve the amendments for it to be passed. At that time, there were a total of 13 states which means that at least 9 out of 13 states were required to approve of the amendment for amending the Articles of Confederation.

the correct labels are as follows:

a: yellow river

b: himalayan mountains

c: north china plain

d: taklimakan desert

well, there are a lot of places we get information about earth from. like science classes, websites, books, newspapers, etc.