As my memory serves me well, innovations like the production of gunpowder, tea, and silk are usually attributed to D. China
Answer:
When the side of the earth that faces the moon experiences a high tide, the side of the earth that is opposite from the moon will have a<u> high tide.</u>
Explanation:
During the rotation of Earth , moon pulls the Earth , since it is close to Earth .
As moon pulls Earth , it also pulls the water in the oceans , and water can move quite easily and the ocean's water tries to bulge towards the direction of the moon . This process is known as tidal force .
Due to this tidal force , some portion of the ocean will bulge out , and this bulge is referred to as high tide.
Gypsum is a chemical sedimentary rock.
Answer:
The correct answer is Bir Tawil.
Explanation:
Bir Tawil is a small area located between Egypt and Sudan, which is in dispute for these two countries. It is said to be the only territory in the world (along with a small portion of the Antarctic), which does not belong to anyone. However, there are constant claims from these two countries that claim to have sovereignty in this territory, but this has not been settled in international courts. Bir Tawil forms a kind of triangle of approximately 2000 m2, and recently a US citizen named Jeremiah Heaton symbolically claimed his sovereignty over these lands to proclaim his little daughter as queen, but no state in the world has recognized him.
Answer:
Iron oxides appeared after the emergence of cyanobacteria.
Explanation:
The composition of Earth's atmosphere in the first couple of billions of years of its existence was nothing like the atmosphere of today. This had a big influence on the processes that were taking place, or rather what processes and to what extent could have happened in those conditions. One big difference between the atmosphere then and after is the levels of oxygen.
Until the appearance of cyanobacteria, the oxygen levels in Earth's atmosphere were very low, and the same goes for the oceans. With a lack of oxygen, the process of oxidation was absent as well. The cyanobacteria though managed to produce oxygen, and this was on such a high scale that they changed the composition of Earth's atmosphere and the oceans. Not just that this enabled complex lifeforms to develop, but it also enabled the process of oxidation. Iron oxides for example occurred only after cyanobacteria appeared, and this can easily be seen when dating the oldest iron oxides and compare that age with the appearance of cyanobacteria.
