The overall specific gravity of the earth is much higher than the specific gravity of crustal rocks which means the earth is about twice as heavy as the rocks on the surface would suggest. Iron meteorites are thought to have the same composition as the average earth, and the meteorites contain a lot more iron than the Earth's surface rocks.
Answer:
(e) arsenate
Explanation:
Arsenate -
arsenate are the chemical compound , that contains the arsenate ion , of formula , AsO₄³⁻ . The valency of the the arsenic atom in the ion is 5 , and has a pentavalent structure .
From the given compound in the question , the compound have an arsenate ion , hence it belongs to the Arsenate family .
Answer:
B - cold and high in nutrients.
Explanation:
Answer: They do not happen every month because the Earth's orbit around the sun is not in the same plane as the Moon's orbit around the Earth. ... Only when the Moon is crossing the plane of the Earth's orbit (the paper) just as it is lining up with the Earth and Sun will an eclipse occur.
Explanation:
Answer:
Radioactive isotopes are unstable and will decay. ... The isotopes will decay into a stable isotope over time. Scientists can tell how old the rock was from looking at the radioactive isotope's half-life, which tells them how long it would take for there to be half the radioactive isotope and half the stable isotope.
