The symbol for potassium is
a. Pm.
b. Po.
c. P.
d. K.
[Ques. 2] Rain that freezes upon striking a cold surface gives rise to a(n) ______________ storm.
Fill in the blank(s) with correct word
[Ques. 3] The symbol for carbon is
a. Ca.
b. Cr.
c. Co.
d. C.
[Ques. 4] Lightning between a cloud and the surrounding air is called ______________.
Fill in the blank(s) with correct word
[Ques. 5] The symbol for Erbium is
a. Er.
b. Yb.
c. Ho.
d. Dy.
e. Tm.
[Ques. 6] The boundary between two air masses is called a(n) ______________.
Fill in the blank(s) with correct word
[Ques. 7] How many elements occur naturally on Earth?
a. 102
b. 88
c. 112
d. 82
[Ques. 8] An air mass forming over the Gulf of Mexico would be classified as ______________.
Fill in the blank(s) with correct word
[Ques. 9] What was the nationality of the first persons who we know speculated about elements?
a. Chinese
b. Egyptian
c. Greek
d. Roman
[Ques. 10] An air mass derives its characteristics from its ______________.
Fill in the blank(s) with correct word