Which of the following is an example of a closed system? a) the earth system b) the ocean c) an ecosystem d) a biome e) material or energy that is able to move in or out of a system

Control of the body is accomplished by which of the following body systems? nervous system and circulatory system endocrine and repertory system circulatory and respiratory systems nervous system and endocrine systems

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?