1) Which two elements are most abundant in Earth's Crust? a) silver and gold b) oxygen and silicon c) lithium and hydrogen d) sodium and chlorine 2) What are the main elements in the ocean? a) sodium, chlorine, hydrogen and oxygen b) carbon dioxide c) phosphorus and sulfur d) silver and gold e) neon and metal 3) Which element makes up 65% of the human body? a) carbon b) hydrogen c) oxygen d) nitrogen e) calcium 4) Which element makes up 21% of the atmosphere? a) hydrogen b) oceans c) sodium d) silicon e) oxygen 5) Which elements cause the ocean to taste salty? a) sodium and chlorine b) nitrogen and oxygen c) sulfur and gold d) potassium and calcium e) iron and aluminum f) neon and hydrogen 6) What are the smallest living units of life? a) ants b) cells c) grasshoppers d) elements e) compounds f) apples 7) What kind of atoms do organic compounds contain? a) carbon b) oxygen c) hydrogen d) neon e) silver f) lithium 8) What 2 elements make up the compound for water? a) nitrogen and oxygen b) hydrogen and oxygen c) lithium and silicon d) gold and sliver e) carbon and oxygen f) calcium and iron

Elements in the Earth

由
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？