Abrasion occurs when this happens.
I believe it’s D as all of these have an effect on erosion and weathering
Answer:
Green revolution, great increase in production of food grains (especially wheat and rice) that resulted in large part from the introduction into developing countries of new, high-yielding varieties, beginning in the mid-20th century. Its early dramatic successes were in Mexico and the Indian subcontinent. The new varieties require large amounts of chemical fertilizers and pesticides to produce their high yields, raising concerns about cost and potentially harmful environmental effects. Poor farmers, unable to afford the fertilizers and pesticides, have often reaped even lower yields with these grains than with the older strains, which were better adapted to local conditions and had some resistance to pests and diseases. See also Norman Borlaug
Continental is the answer
The answer is 4t, since their is no number after the plus sign you would assume that their is a one place there. you would multiply 1 by t and by -2t which would leave you with this equation; 5t+1t-2t, which is simplified into 4t