X rays are used in radar
a. True
b. False
Indicate whether the statement is true or false
False
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The components of polyester are _________toxic than epoxy.
Fill in the blank(s) with the appropriate word(s).
Why might we think that silicon would be an obvious alternative to carbon as a building block for biological molecules?
A) it forms the basis of some life forms on Earth B) it has a similar abundance on Earth to carbon C) it forms complex molecules like carbon D) it has a similar electronic structure to carbon, forming a maximum of four bonds and, hence, should have a similar chemistry
Even though Venus is almost the same size as the Earth it does not have plate tectonics. This is most likely because
A) it has cooled more rapidly so that there is not enough internal convection to break up its crust B) it has no oceans for subduction and seafloor spreading to occur in C) due to the high temperatures at its surface, its crust has dried up and thickened so it cannot break up into plates D) impacts have filled its plate boundaries essentially turning the process off
The quark structure of the neutron is udd
Indicate whether the statement is true or false