A boat leaves a dock at 2:00 pm and travels due south at a speed of 20 kmyh. Another boat has been heading due east at 15 kmyh and reaches the same dock at 3:00 pm. At what time were the two boats closest together?
Geology Midterm Definitions Rock: A coherent, naturally occurring solid, consisting of an aggregate of minerals, or, less commonly, of glass. Cement: What bonds rocks, mineral material that precipitates from water and fills the space between grains. Clastic: Rocks that are held together by cement Crystalline: Rocks whose crystals interlock with one another, rocks that originate as a continuous mass. Bedrock: Rock that is still attached to the earth’s crust Outcrop: An exposure of bedrock Igneous rocks: Rocks that form by the freezing of molten rock. They cool and crystalize to form a liquid state. Lava= extrusive and magma=intrusive. Extrusives are finely grained and intrusives are not. Examples: Intrusive=granite and extrusive= b