Answer:
<h2>
<u>W</u><u>ater</u> covers 70 percent of earth's surface.</h2>
Answer:
1. open
2. open
Explanation:
1. An open system can exchange energy and matter.
2. The ocean is known to be an open system.
A mixture consists of numerous substances, whereas a substance does not consist of mixtures, but rather of compounds. Mixtures can be separated physically, while substances cannot.
Answer: [Ne] 3s¹ sodium electron configuration