Answer:
Although the inner core is very hot, it is solid because it is experiencing very high pressure.
The outer core is not under enough pressure to be solid, so it is liquid even though it has a composition similar to the inner core.
Explanation:
The state of matter (solid, liquid or gas) of a given material depends on its temperature and pressure.
Answer:
A. & D.
Explanation:
A. People first stood upright.
D. Animals were domesticated.
D. Twenty countries whose people share a common religion and cultural heritage
The tropical rain forests are the places on the land that have by far the highest biodiversity, both in plant and animal life. Because they have such a high biodiversity, and the vegetation is evergreen and constantly active, they have a huge effect on the global biosphere. They're the ones that increase the numbers and diversity on the planet, but also that huge biodiversity, especially in the plant life, contributes to higher levels of oxygen into the atmosphere, and that is very beneficial for all of the biodiversity on the planet. It is not coincidence that the Amazon rain forest, the largest in the present, is nicknamed ''the lungs of the Earth''.
Sustainable use practices are practices that are used in the use of resources for example that seek to maintain the longevity and continuance of the potential use of that resource. In regards to trees and logging the sustainable use of wood or paper would seek to continue the longevity and vitality of the forests by not overusing these products. Sustainable use will use a resource at a rate that will allow for natural replenishment or incremental use of the resource to prevent harm to the environment and allow the resource to be used far into the future.
