Answer:
d
Explanation:
There are two basic types of variable stars: intrinsic variables, whose luminosity actually changes, and extrinsic variables, whose apparent changes in brightness are due to changes in the amount of their light that can reach Earth. A star could be an intrinsic variable because it periodically swells and shrinks.
lunar rock was brought back to Earth by Apollo<span> astronauts and unmanned Soviet landers, hope this helps.</span>
Answer: Individuals can help in the earthquake disaster by 3 rules. The first rule is looking out for there neighbor if they see that they are stuck within the rubble of the earthquake . The second rule would to get yourself and your family out of the Quake zone. The third rule is always helping in a dire need like this one here if you are not able to help then please provide supplies to the teams that are willing to go searching for people. A community can not thrive on one man or woman they need all arms say if your home was destroyed in the quake I would hope your Community would be there to patch you up with there volunteers nobody can stand alone in this quake disaster if you do so then there is no Community .
Earths history of climate is easily understandable through the study of existing rock and shells aquatic organisms. Rocks came into the earth million of years ago. So, the study of age determinism of rock gives an idea of climate through which it has come across. This is called paleontology.
Explanation:
In studying Earth's history of climate scientists take help of available rocks and body parts of aquatic animals. As rocks are the most eventful findings on the earth's surface which has come across million of years and witnessed several changes. These study if changes in rock is called paleontology.
Shells of aquatic animal which found in underwater are also a good evidence of earth's history of climate. It is found in the layers of sedimentary rock which is soft in nature and found in layerwise. Where all the organism became fossil after death and its body parts remains in the form of stone.
The first one is wrong because they were still in disarray and revolution at the time being. They couldn't quite do this at the time due to those two problems.