【单选题】In 1831 when Smith was finally recognized by the Geological Society of London as the 'father of English geology,' it was not only for his maps but also for something even more important. Ever since pe...
A.
the rocks from different strata closely resembled each other
B.
he was often unable to find fossils in the younger rock strata
C.
their similarity to each other made it difficult for him to distinguish one rock type from another
D.
the type of rock between two consistent strata was always the same
【多选题】零件表面是由()、()、()、()、球面、圆环面、螺旋面等组成。
【单选题】The unit of geological time is _______ ?
【简答题】某小组同学对废干电池筒内的黑色固体(内含有MnO 2 、NH 4 Cl、ZnCl 2 等)进行了如下图所示的实验: (1)操作②的名称是________,该操作中玻璃棒的作用是________。 (2)操作③灼烧滤渣黑色固体时,会产生一种使澄清石灰水变浑浊的气体,由此推测滤渣中除含有MnO 2 外,还存在的物质是_________。 (3)操作④的试管中产生的气体使带火星的木条复燃,则该气体为__...
【简答题】某小组同学对废干电池筒内的黑色固体(内含有MnO 2 、NH 4 Cl、ZnCl 2 等)进行了如下图所示的实验: (1)操作②的名称是 ,该操作中玻璃棒的作用是 。 (2)操作③灼烧滤渣黑色固体时,会产生一种使澄清石灰水变浑浊的气体,由此推测滤渣中除含有MnO 2 外,还存在的物质是 。 (3)操作④的试管中产生的气体使带火星的木条复燃,则该气体为 。 (4)已知在氯化锌溶液中逐滴滴入稀氨水,先...
【单选题】(The age of) a geological sample can (be estimated) from the ratio of radioactive to nonradioactive carbon (present) in the object (is examined).