Do high tides occur more than low tides? Since the Earth rotates through two tidal “bulges” every lunar day, we experience two high and two low tides every 24 hours and 50 minutes. High tides occur 12 hours and 25 minutes apart, taking six hours and 12.5 minutes for the water at the shore to […]

What are 3 ways to classify an aquatic ecosystem? There are three basic types of freshwater ecosystems: Lentic: slow moving water, including pools, ponds, and lakes. Lotic: faster moving water, for example streams and rivers. Wetlands: areas where the soil is saturated or inundated for at least part of the time. What 4 characteristics determine […]

Why is dissolved oxygen highest near the surface? As the chart shows, the concentration of dissolved oxygen in surface water is affected by temperature and has both a seasonal and a daily cycle. Cold water can hold more dissolved oxygen than warm water. In winter and early spring, when the water temperature is low, the […]

Where do rubies and emeralds come from? Rubies have historically been mined in Thailand, the Pailin and Samlout District of Cambodia, Burma, India, Afghanistan, Australia, Namibia, Colombia, Japan, Scotland, Brazil and in Pakistan. In Sri Lanka, lighter shades of rubies (often “pink sapphires”) are more commonly found. Where does ruby stone come from? Historically, rubies […]

How did Wegener prove continental drift? Fossils of similar organisms across widely disparate continents encouraged the revolutionary theory of continental drift. He called this movement continental drift. Pangaea. Wegener was convinced that all of Earth’s continents were once part of an enormous, single landmass called Pangaea. What evidence did Wegener not support the continental drift […]

How do you tell time at sea? For purposes of telling time on board ship, the day starts at midnight, or what is the same thing, the day starts at 12:00 a.m. with the midnight watch, called the Middle Watch in nautical parlance. After the first half hour on duty, the watch rings the ship’s […]

What are the process that lead to the formation of minerals? The four main categories of mineral formation are: (1) igneous, or magmatic, in which minerals crystallize from a melt, (2) sedimentary, in which minerals are the result of sedimentation, a process whose raw materials are particles from other rocks that have undergone weathering or […]

What is formed by cooling and crystallization of magma? Igneous rocks form when magma (molten rock) cools and crystallizes, either at volcanoes on the surface of the Earth or while the melted rock is still inside the crust. When lava comes out of a volcano and solidifies into extrusive igneous rock, also called volcanic, the […]

What season is it in the northern part of the world when the North but is tilted towards the sun? summer What season will it be in the UK when the Earth’s top axis is tilted towards the sun? We get different seasons (winter, spring, summer and autumn) because the Earth’s axis is tilted. This […]

What happens to water in the ground when it reaches impermeable materials? What happens to water in the ground when it reaches impermeable materials? The water stays there and forms a water table, like when you dig down in sand and reach water. Water underground trickles down between preamble materials; such as particles of soil […]