Can an object be completely transparent? Materials like air, water, and clear glass are called transparent. When light encounters transparent materials, almost all of it passes directly through them. Glass, for example, is transparent to all visible light. Translucent objects allow some light to travel through them. What are the conditions for an object to […]
Why do earthquakes occur in western South America?
Why do earthquakes occur in western South America? Most of the large earthquakes in South America are constrained to shallow depths of 0–70 km as a result of both crustal and interplate deformation. Crustal earthquakes are caused by deformation and mountain building in the overriding South America plate and generate earthquakes as deep as approximately […]
What is the difference between lithosphere hydrosphere and atmosphere?
What is the difference between lithosphere hydrosphere and atmosphere? The atmosphere, therefore, consists of gases that envelop the Earth. The hydrosphere defines the water that covers 71% of the Earth’s surface. The lithosphere refers to the rocks of the Earth’s surface and upper mantle, or the depth of the plates. As you go higher in […]
Do mollusks have a closed circulatory system?
Do mollusks have a closed circulatory system? Most mollusks have an open circulatory system but cephalopods (squids, octopus) have a closed circulatory system. The blood pigment of mollusks is hemocyanin, not hemoglobin. The heart of a clam can be seen in the photograph below. What organisms have a closed circulatory system? In (a) closed circulatory […]
Why can I see bacteria in my eye?
What is the most significant predictor of basal metabolic rate?
What is the most significant predictor of basal metabolic rate? The major factor determining basal metabolic rate (BMR) is fat-free mass (FFM) (1–3), with some studies finding an additional contribution of fat mass (FM) (4, 5), but others failing to find such an effect (6, 7). Which person would you predict to have the highest […]
What are the two types of river erosion?
What are the two types of river erosion? Types of erosion Hydraulic action – This is the sheer power of the water as it smashes against the river banks. Abrasion – When pebbles grind along the river bank and bed in a sand-papering effect. Attrition – When rocks that the river is carrying knock against […]
Which location on Earth receives the most direct sunlight?
Which location on Earth receives the most direct sunlight? The equator Which direction gets the least amount of sun? How to properly orient your home South-facing rooms allow most winter sunlight, but little direct sun during the summer. North-facing rooms admit relatively even, natural light, and almost no unwanted summer heat. East-facing rooms receive the […]
How can you tell if an oxygen cylinder is empty?
Does every experiment need a control group?
Does every experiment need a control group? An experiment may include multiple experimental groups at one time. A control group is a group separated from the rest of the experiment such that the independent variable being tested cannot influence the results. While all experiments have an experimental group, not all experiments require a control group. […]