ENV234H1 Lecture 3: Climate and environmental change over the last million years
Document Summary
Please post questions on the blackboard discussion board before e-mailing the instructor. Molten material that gets stuck in crust and solidifies: sedimentary. Formed from igneous or sedimentary put under high temperature and pressure. Subduction: 1 tectonic plate moves under another continental plate. Lava (molten rock) flows out of volcano then cools forming igneous rock. Gas bubbles and crystals in lava form small holes in igneous rock. After solidification of rock (lava), rain comes on solidified igneous rock: causes erosion/weathering of rock, rain water is usually a bit acidic which dissolves rock, see river valley. River transports sediments into lakes/oceans: some particles are transported in suspension (smaller particles, larger particles are dragged along river floor. River flows into ocean and fills ocean up with sediment layer by layer. Env234h1 september 21st, 2015: lower layer of sediment is older, sediments settle on bottom of ocean, sediments get finer and finer as move more further into the ocean (away from river source) because:
