Answer:
G
Explanation:
Burning non-renewable resources to generate electric power is extremely bad for the environment. This has been done in the past and continues at an even greater rate since the Industrial Revolution.
Although the Green Revolution is slowly replacing coal and petroleum with renewable resources, the large scale extraction and consumption of petroleum products has no historical precedent and the resources cannot be replaced.
Their progress and wealth is highly dependent on the harvests, and the price of grain. They probably have to import some industrial products and if they had a bad year (weather, other catastrophies, poor technology) they can't get the necessary amount of industrial products in exchange for their surplus e. g. in grain. There are so many standards and requirements about the quality of food production that no country can survive solely on agriculture without high quality technology (machines, unharmful fertilizers, research-based breeding, etc.).
Answer:
True
Explanation:
A nebula is a gigantic space cloud of dust and gas. Several nebulae (more than one nebula) come from the gas and dust thrown out by the explosion of a star that is dying, like a supernova. Other nebulae are giant celestial dust clouds where new stars are starting to form. Nebulae are made of dust and gas—mostly hydrogen and helium.