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The Byzantine Empire was able to take advantage of the turmoil to expand its political influence and commercial relationships, first with the Khazars and later with the Rus' and other steppe groups. The Byzantines established the Theme of Cherson, formally known as Klimata, in the Crimea in the 830s to defend against raids by the Rus' and to protect vital grain shipments supplying Constantinople. Cherson also served as a key diplomatic link with the Khazars and others on the steppe, and it became the centre of Black Sea commerce. The Byzantines also helped the Khazars build a fortress at Sarkel on the Don river to protect their northwest frontier against incursions by the Turkic migrants and the Rus', and to control caravan trade routes and the portage between the Don and Volga rivers.

What did the Byzantines help the Khazars with?
Answer: build a fortress at Sarkel
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Hydrogen is sometimes produced and consumed in the same industrial process, without being separated. In the Haber process for the production of ammonia, hydrogen is generated from natural gas. Electrolysis of brine to yield chlorine also produces hydrogen as a co-product.

When hydrogen is generated from natural gas, what des it produce?
Answer: ammonia
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Methodism identifies principally with the theology of John Wesleyan Anglican priest and evangelist. This evangelical movement originated as a revival within the 18th-century Church of England and became a separate Church following Wesley's death. Because of vigorous missionary activity, the movement spread throughout the British Empire, the United States, and beyond, today claiming approximately 80 million adherents worldwide. Originally it appealed especially to workers, agricultural workers, and slaves.

Who was the inspiration for Methodism?
Answer:
John Wesley