Q: Q: What has increased in the atmosphere throughout the history of the earth? Read this paragraph and choose the correct option from the provided answers: Oxygen has increased in the atmosphere throughout the history of the earth. Note the logarithmic scale, which indicates great increases after first photosynthesis (in bacteria) and then land plants evolved. Related geological events: A = no oxidized iron; B = oxidized iron bands in seabed rock - evidence for O 2 in the oceans; C = oxidized iron bands on land and ozone layer formation- evidence for O 2 in the atmosphere. Choices: - nitrogen - wind - carbon - oxygen A:
A: oxygen

Q: Q: Generators usually transform kinetic energy into what kind of energy? Read this paragraph and choose the correct option from the provided answers: Generators may produce either alternating or direct current, but they all change kinetic energy to electrical energy. Choices: - subsequent energy - potential energy - nuclear energy - electrical energy A:
A: electrical energy

Q: Q: Photographs of the heat emitted by an object are called what? Read this paragraph and choose the correct option from the provided answers: Choices: - radio images - variable images - cosmic images - thermal images A:
A: thermal images

Q: Q: What form of radiation is the energy emitted by the sun? Read this paragraph and choose the correct option from the provided answers: Figure 8.11 The sun emits energy in the form of electromagnetic radiation. This radiation exists at different wavelengths, each of which has its own characteristic energy. All electromagnetic radiation, including visible light, is characterized by its wavelength. Choices: - seismic - magnetic - thermal - electromagnetic A:
A: electromagnetic