Initially they were cautious and defensive; Caesar's first invasion got bottled up at the coast, and withdrew. His second fared better, and it became clear the Britons could not defeat Caesar in a pitched battle. They turned to guerilla warfare, using chariots for mobility, and slowed the Romans down. The Romans used their close infantry tactics to punch through British positions, such as fortified fords, and built camps for defence. These tactics paid off, and Caesar was able to set up the Trinovantes as a tributary nation.
<span>The subsequent invasions followed similar methods. The Roman advantage of armour and close infantry tactics usually paid off, and they were able to choose which tribes to make an example of. Mostly the rest would surrender. This became harder, though, in the mountains of Wales and Scotland; the local tribes used ambushes and guerilla warfare to their advantage. The Romans went about destroying their settlements, trying to bring them to heel. </span>
<span>England and Wales was eventually subjugated, but much of Scotland was not. The Antonine wall between the Forth and Clyde marked the northern frontier.</span>
1.It completely dodged any decimalization of time( except fractions of a second). [Though decimalization of time had been and continues to be discussed ad nauseum.] The second is now so embedded into the metric system that we would have to scrap it entirely if we changed to any other measure of time. 2. It completely dodged any change at all to angles including decimalization. It no longer defines an angle unit at all, and considers radians to be a derived unit of metres/metre. And degrees are often used anyway, because having an angular measure in radians is ... well ... irrational! 3. It works terrifically well with decimal arithmetic, and horribly with fractions (except for fractions like 1/2, 1/5, 1/10 - that is, factors of 10). Dividing anything into thirds (or any fraction including a factor of 3) is not exactly possible. 4.It still has weird units (some of which are officially “non-SI” metric units) a. The primary unit of weight is the kilogram. That is, the gram isn’t defined, the kilogram is. The gram is derived as 1/1000 kilogram, which CERTAINLY isn’t the basic metric philosophy to pick consistent base units and then apply prefixes. Here the base unit has a prefix, and the un-prefixed unit is derived. b. Although there are prefixes for 10, 100, 1/10, 1/100 (even for 10,000, etc.), they are mostly not used, in favor of only multiples of 1000. (Centimeters is a notable exception.)
c. When measuring really small things, half the time nanometers are used, and half the time Ångstroms are used, which are “deci-nanometers”.
d. Micrometers are called microns. e. 1 J = 1 W * s. But electrical usage is measured in kW-hr, which are 3.6 MJ. In chemical bond energy, kilocalorie is used (“small calorie”). In food packaging, Calories are used (“large calorie”), where 1 Calorie = 1 kilocalorie. (note big C and little c.) 1 cal ~= 4.2 J; 1 Cal. ~= 4.2 kJ. (approximate, due to the particulars of the various definitions of calorie.) I conclude, a joule is a lousy unit of energy to have picked. f. While many things have been corrected, luminance is still pretty screwed up. First, you have watts, candelas, lumens, lux, each meaning brightness, but in a little different sense. But the primary metric unit is candela. However, candela is just the same “candle” power in use before the metric system – literally the light of one (“standard”) candle. But, like the second, it’s been scientifically respecified: even though candles shine infinitely many different frequencies, a candela is the luminous intensity, in a given direction, of a particular pure green light (which humans are most sensitive to) with a radiant intensity (in that direction) of 683 Watts per steradian. Why not of 1 W, or 1 kW? Because it’s about the same as the previous candle (candlepower, foot-candle). Any other color of light, or blend of colors, has to be adjusted by an assumed “standard human eye” sensitivity curve. (And, historically, the candela was originally specified by the glow of freezing platinum equated to 60 candles. That should make you feel warm.)
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Bedrock geologic map illustrating the main geologic regions of Minnesota. Igneous bodies lie across the northern half of the state, with intrusions throughout the northwest and basalts and other igneous rocks of the Duluth Complex and Beaver Bay Complex from the Midcontinent Rift System bordering Lake Superior in the northeast.
The flow of energy in an ecosystem started with sunlight, and then follows the food chain and ends with the tertiary.
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Answer:
Tectonic plates cover the entire Earth and are like a shell that sits underneath the top layer of the ground.
These plates sit on top of hot inner layers of the Earth, and they slowly move around on this melted layer.
Think of it like ice cubes moving around on top of your glass of water. Even though these tectonic plates are all over, there is a certain part of the Earth where more trouble happens than others.
Tectonic plates are pieces of land that connect together on the Earth’s outer shell. You can think of them like a giant round puzzle that cover Earth underneath the ground.
These pieces bump together and move, even though it is only a couple of centimeters a year. This movement causes all kinds of things to happen, such as volcanoes, earthquakes, and tsunamis.
The part of the land that is moving is the Earth's surface called the lithosphere. The lithosphere is made up of the Earth's crust and a part of the upper mantle. The lithosphere moves in big chunks of land called tectonic plates. Some of these plates are huge and cover entire continents.
Most of the Earth is covered by seven major plates and another eight or so minor plates. The seven major plates include the African, Antarctic, Eurasian, North American, South American, India-Australian, and the Pacific plates. Some of the minor plates include the Arabian, Caribbean, Nazca, and Scotia plates.
Plate Boundaries The movement of tectonic plates is most evident at the boundaries between the plates. There are three main types of boundaries: Convergent Boundaries - A convergent boundary is where two tectonic plates push together. Sometimes one plate will move under the other. This is called subduction. Although the movement is slow, convergent boundaries can be areas of geological activity such as the forming of mountains and volcanoes. They can also be areas of high earthquake activity. Tectonic plate convergence Divergent Boundaries - A divergent boundary is one where two plates are getting pushed apart. The area on land where the boundary occurs is called a rift. New land is formed by magma pushing up from the mantle and cooling as it reaches the surface. Transform Boundaries - A transform boundary is one where two plates slide past each other. These places are often called faults and can be areas where earthquakes often occur. Interesting Facts about Plate Tectonics One famous transform boundary is the San Andreas Fault in California. It is the boundary between the North American Plate and the Pacific Plate. It is the cause of so many earthquakes in California. The Mariana Trench is the deepest part of the ocean. It is formed by a convergent boundary between the Pacific Plate and the Mariana Plate. The Pacific Plate is being subducted under the Mariana Plate. Scientists are now able to track the movement of tectonic plates using GPS. The Himalayan Mountains, including Mount Everest, were formed by the convergent boundary of the Indian Plate and the Eurasian Plate.