1. <span>an expert in or student of anthropology 2. </span><span>an expert in or student of the development, structure, and functioning of human society 3. the people 4. </span>Urban geography<span> is the subdiscipline of </span>geography<span> which concentrates on those parts of the </span>Earth's surface<span> that have a high concentration of </span>buildings<span> and </span><span>infrastructure 5. </span><span>are atmospheric scientists who study the Earth's climate 6. </span><span>A geologist is a scientist who studies the solid and liquid matter that constitutes the Earth as well as the processes that shape it 7. </span><span>is a scientist who studies fossils. If your basement is filled with fossils found while out on hikes, then you're an amateur </span><span>paleontologist 8. </span><span>covers a wide range of topics, including marine life and ecosystems, ocean circulation, plate tectonics and the geology of the sea floor, and the chemical and physical properties of the ocean</span>
A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha decay, beta decay, and gamma decay, all of which involve emitting one or more particles or photons.
