1. which of these most threatens the waters of the niger river? industrial pollution nuclear pollution overcrowding erosion 2. which of these would be seen as the least likely threat to africa’s water supply? erosion deforestation nuclear waste industrial waste 3. the area with water tables most at risk of being contaminated can be found in central africa southern africa north central africa north eastern africa

Mr. mann's science students were experimenting with speed. they set up a 1 meter (100 cm) track. the students used balls instead of cars. the balls were different sizes and made of different materials. four at a time, students rolled balls around the track to see which had the fastest and slowest speeds. some of their data are shown in the table. which ball will take the longest to complete one lap around the track?

One of the main challenges that the colonists faced was the

Put these events in the correct order #1-4. cause: world war 1 caused heavy casualties and property damage throughout europe. many people barely had enough food to eat or coal to stay warm. what happened next? question 1 options: russia, now led by lenin, became the first communist nation in history. communism soon spread to many small countries near russia, and eventually spread to cuba, china, and vietnam. led by vladimir lenin, a group called the bolshevik party gained the support of the people and overthrew russia’s monarchy, killing czar nicholas ii and his family. russian citizens, who were starving and poor, became angry at the ruling class who held all of the nation’s wealth. (write them in order of which they happened)