Several objects were called planets when they were originally discovered, but are no longer called planets
Indicate whether the statement is true or false
TRUE
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Which stellar population has highly elliptical orbits?
a. Pop I extreme b. Pop I intermediate c. Pop II intermediate d. Pop II extreme
The magnetic field of Mars was first detected by the Mars Global Surveyor
Indicate whether the statement is true or false
Your friend says that the helium used to inflate balloons is a product of radioactive decay. Another friend says no way. With whom do you agree?
A) If helium were a product of radioactive decay, we would all be radioactive. Agree with the friend that says "no way." B) Radioactive decay produces alpha particles, not helium. Agree with the friend that says "no way." C) Your first friend is correct. Radioactive isotopes emit alpha particles which, in turn, capture electrons and become helium atoms. D) Helium is an element of the periodic table, not some product of any reaction. Agree with the friend that says "no way."
Magma viscosity depends on the silica content and the ______________ of the magma
Fill in the blank(s) with correct word