instruction:
In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.
question:
In marine sediments the biological production of methane , also termed methanogenesis , is generally confined to where sulfates are depleted , below the top layers .
answer:
In marine sediments methane is produced when sulfates are low .


question:
In computing , a crash , or system crash , occurs when a computer program such as a software application or an operating system stops functioning properly and exits .
answer:
A Computer crash is when a computer program stops running normally .


question:
A siddur ( Hebrew : סדור -RSB- ; plural siddurim , -RSB- ) is a Jewish prayer book , containing a set order of daily prayers .
answer:

A siddur is a Jewish prayer book .