The answer is (B)
beginning in the 1940s, both the United States and Russia lead the way and successfully testing nuclear weapons
U.S. conducted six atomic tests before Russia developed
their very first atomic bomb (RDS-1) and tested it on the 29th of
August, 1949. Testing these bombs back then for both countries were relatively
infrequent because they did not have very many atomic bombs to spare. The
Trinity was tested on the 16th of July 1945 and yielded around 20 kilotons.
Trinity, which was conducted in New Mexico was tested to give an idea of the
actual size and the after- effects of a nuclear explosion. Operation first
lightning or the RDS-1 also known as Joe 1 in the west was tested on August 29th
1949 and considered this test as the first Soviet nuclear test.
The length of time that a volcanic eruption impacts the climate is determined by the capacity of the volcano and how much material it will let out in the atmosphere. The smaller the volcano, with smaller capacity, the smaller effect it'll have on the climate and the duration of it's impact, and the space on which it'll have climatic impact. The bigger the volcano, with bigger capacity, the bigger the effect on the climate and the duration of it, and the bigger the space it will have climatic impact on.
If one bank of a river is disturbed and begins to crumble, water fills the hole and sweeps away loose dirt. Over time, this creates a bigger and bigger hole in the river bank. As the water begins to rush faster through the new opening, it slows on the opposite river bank. Because slow-moving water can’t carry as much weight as fast-moving water, loose dirt and rocks build up on that side, making it more shallow. Eventually, the build-up creates new land and a new curve in the river’s watercourse.The new curve causes the water running against the outside bank to pick up enough momentum that it slams into the opposite bank further down the river, creating another curve. As more time passes, the rushing water creates more and more curves downstream
That's where all the heat from earth comes from I think
