The collapse of the Soviet Union
<span> factors were responsible for environmental improvements in Eastern Europe during the 1990s</span>
events that occurred in the 20th century that were mainly because of the wars were the fall of four major monarchies (Russian, Austrian/Hungarian, German and Turkish) and conflicts in alliances (world war 1). and a huge event that occurred in the 20th century was the great depression.
sorry i didn't include all of it, that's as much as i could remember haha, hope this helped at least a little!
It is C I'm pretty sure. Hope I'm right so I can get brainliest! :o
Pretty Sure it's B, <span>The </span>geological time scale<span> (</span>GTS<span>) is a system of </span>chronological dating<span> that relates geological strata (</span>stratigraphy<span>) to time, and is used by </span>geologists<span>, </span><span>paleontologists</span>
