True. The crust of the Earth has some permanent magnetization, and the Earth's core generates its own magnetic field, sustaining the main part of the field we measure at the surface. So we could say that the Earth is, therefore, a "magnet."
Answer:
I) George is correct
Reason: Sound waves, an example of mechanical wave is only longitudinal NOT tranverse
Explanation:
The difference is that the direction of a tranverse wave is perpendicular to the direction of vibration unlike the direction of a longitudinal wave that is same as the direction of the vibration.
Also examples of mechanical waves are water waves (tranverse) and sound waves (longitudinal). Thus GEORGE IS CORRECT having stated that "sound waves were longitudinal and not transverse" unlike sally who made a non-specific statement
Question: When an atom that has no charge loses two electrons, it becomes a:
A: positive ion.
B: negative ion.
C: positive isotope.
D: negative isotope.
Answer:
When an atom that has no change loses two electrons, it becomes "positive ion".
Explanation:
It is known that electrons hold a negative charge. So, when the negative charge that is electrons are taken out an atom then the number of electrons become less in number as compared to the number of protons. Hence, the atom attains a positive charge.An isotope is formed when an atom shows same number of protons and different number of neutrons. So, when an atom loses 2 electrons there will be no change in the number of neutrons. Therefore, an isotope will not form.Thus, it is concluded that when an atom with no charge loses two electrons, it becomes a positive ion.
Answer:
Cities can be built in otherwise uninhabitable places.
Explanation:
The hormone is called adrenaline