Which of the following type(s) of rock can be used to reliably date a planetary

Question

Which of the following type(s) of rock can be used to reliably date a planetary surface? Igneous Metamorphic Sedimentary All of them can be reliably used to date a planetary surface. (a) and (b)only (a) and (c)only (b) and (c)only Which type of volcanic feature is commonly observed on Io, Enceladus, and Triton? Composite volcanoes Shield volcanoes Flood basalts Geysers Earth's internal energy comes primarily from what source(s)? Accretion Radioactive decay The Sun All of these sources provide Earth's internal energy (a) and (b)only (a) and (c)only (b) and (c)only In what part(s) of Earth's interior is the magnetic field generated? crust upper mantle lower mantle outer core inner core (a) and (b) only (b) and (c) only (d) and (c) only

Explanation / Answer

19) a and b only

Igneous rocks can be dated by the radioactive dating techniques. It is not possible in the case of sedimentary and metamorphic rocks.

We know that upper parts of the earth's crust is occupied by 75% of sedimentary rocks . So we can date the sedimentary rocks by the dating impact craters .

20) geyser

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