What is china doing to prevent the desertification of its land?
building dams
dredging rivers
planting trees
digging canals
select all that apply

Building dams, dredging rivers and planting trees.

Explanation:

 The process of land degradation is known as desertification in which the lose of wildlife, vegetation and as well as water bodies become increases. The desertification is mainly caused by the change in the climate and various types of human activities.

 So, by planting more and more trees in our surrounding and dredging river prevent the process of desertification. The china also prevent the desertification by building dams as they store water for future used and reduce the process of desertification.  

the thirteen colonies are:

connecticut, delaware, georgia, maryland, massachusetts, new jersey, new york, new hampshire, north carolina, pennsylvania, rhode island, south carolina, virginia