Answer:
C. The greater an element's density, the smaller the amount of it found in the crust
Explanation:
The layering of the Earth happened because of the different densities of the elements from which it was made. The denser elements started to sink deeper, the elements with medium density occupied the central part, and the elements with the smallest density remained at the surface. This resulted in the formation of the three basic layers of the Earth, core, mantle and crust. The core is composed of the densest elements, the mantle of the ones with medium density, and the crust from the ones with smallest density.
Of the globular clusters<span> within the </span>Milky Way<span>, the majority are </span>found<span> in a halo around the galactic core, and the large majority are </span>located<span> in the celestial sky centered on the core.</span>
Answer:
False
Explanation:
This presents somewhat of a paradox, as the cool early Earth hypothesis suggests temperatures were cold enough to freeze water between about 4.4 billion and 4.0 billion years ago. Other studies of zircons found in Australian Hadean rock point to the existence of plate tectonics as early as 4 billion years ago.
Answer:
3) Conventional methods have a bad impact on environment because they usually don't consider the quality of the soil. Monoculture, known as the plantation of one single crop for a long time and in a large area, is very harmful for the land because it takes all the nutrients from the soil, usually making it useless for future crops.
For pesticides and fertilizers, is important to understand that it doesn't only affect the plants that you want to grow, but all the nature living around the plantation. It affects the wild plants, the non-harmful insects and animals, and of course, it pollutes the soil and any water that is nearby. It also polutes the air.
The GMOS also threathen the lives of all animals and plants around the plantation. It could change the characteristics of the soil microbial population, that carries nitrogen and other essential elements. And one of the most known, it could affect human beings by eating the genetically modified food or by breathing air contamined with the GMO products.
4) To improve your health and help the environment, one of the main things you have to do is keep an organic diet. Usually organic produts are a little more expensier and sometimes they don't last as long as the regular ones, but it is a good trade when it counts to your health and estimulates farmers to keep an organic plantation to help the environment. Try keeping an eye on the label, if it says non GMO and organic, it is better for you. Usually what helps the environment and whats healthier for us goes together, because usually what comes straight from nature (if its not poisonous or anything like that) is whats best for us.
