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Discoveries of aquifers — underground earth formations that hold water — often create excitement around their ability to ease water scarcity in a region. The United States recently announced the discovery of five aquifers in Niger, one of Africa’s most water scarce countries, containing over 600 billion cubic metres of water. To put it into perspective, Egypt’s current water demand is 114 billion cubic metres of water per year.
These are welcome announcements. Due to a changing climate and the increasing demands of a growing population, many of Africa’s surface water resources — such as dams and rivers — are facing serious risks. They’re being overused and slowly decreasing.
Alternative water sources, like aquifers, need to be explored. They are highly prevalent across the African continent, but they’re not always going to help address water scarcity. For instance, early research findings deemed Kenya’s Turkana aquifer water unfit for use due to high salinity. It’s important to bear these challenges in mind so that expectations can be managed. It is also useful for planners and governments, as they need to think of other ways around the water scarcity problem.
(Gaathier Mahed. https://theconversation.com, 21.03.2023. Adaptado.)
A frase do texto que expressa ideia de causa é:
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Discoveries of aquifers — underground earth formations that hold water — often create excitement around their ability to ease water scarcity in a region. The United States recently announced the discovery of five aquifers in Niger, one of Africa’s most water scarce countries, containing over 600 billion cubic metres of water. To put it into perspective, Egypt’s current water demand is 114 billion cubic metres of water per year.
These are welcome announcements. Due to a changing climate and the increasing demands of a growing population, many of Africa’s surface water resources — such as dams and rivers — are facing serious risks. They’re being overused and slowly decreasing.
Alternative water sources, like aquifers, need to be explored. They are highly prevalent across the African continent, but they’re not always going to help address water scarcity. For instance, early research findings deemed Kenya’s Turkana aquifer water unfit for use due to high salinity. It’s important to bear these challenges in mind so that expectations can be managed. It is also useful for planners and governments, as they need to think of other ways around the water scarcity problem.
(Gaathier Mahed. https://theconversation.com, 21.03.2023. Adaptado.)
In the excerpt from the first paragraph “To put it into perspective, Egypt’s current water demand is 114 billion cubic metres of water per year”, the underlined expression means to
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Leia o texto para responder à questão.
Discoveries of aquifers — underground earth formations that hold water — often create excitement around their ability to ease water scarcity in a region. The United States recently announced the discovery of five aquifers in Niger, one of Africa’s most water scarce countries, containing over 600 billion cubic metres of water. To put it into perspective, Egypt’s current water demand is 114 billion cubic metres of water per year.
These are welcome announcements. Due to a changing climate and the increasing demands of a growing population, many of Africa’s surface water resources — such as dams and rivers — are facing serious risks. They’re being overused and slowly decreasing.
Alternative water sources, like aquifers, need to be explored. They are highly prevalent across the African continent, but they’re not always going to help address water scarcity. For instance, early research findings deemed Kenya’s Turkana aquifer water unfit for use due to high salinity. It’s important to bear these challenges in mind so that expectations can be managed. It is also useful for planners and governments, as they need to think of other ways around the water scarcity problem.
(Gaathier Mahed. https://theconversation.com, 21.03.2023. Adaptado.)
The text intends to
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Considere a equação quadrática x2 – 4x + c = 0, sendo c um número real que faça com que a equação tenha duas raízes reais distintas não negativas. Sendo assim, o conjunto de todos os valores reais que c pode assumir, e somente eles, é tal que
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Cada local de uma cidade plana pode ser representado por um par ordenado (x, y) em um plano cartesiano desenhado sobre o mapa dessa cidade. A figura mostra esse plano cartesiano, com a indicação de duas ruas retilíneas que são perpendiculares no ponto de coordenadas (8, 3).
Mariana mora nessa cidade, no ponto em que a representação da Rua São Camilo no plano cartesiano intersecta o eixo x. Esse ponto tem coordenadas
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Um paralelepípedo será dividido em dois prismas, conforme mostra a figura.
Após separados, a soma das áreas totais dos dois prismas irá superar a área total do prisma original em
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A figura mostra os triângulos MEP e REP, que compartilham o lado \( \overline {EP} \).
A área do triângulo MER, em cm2, é igual a
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Ana, Beto e Cléo fizeram as seguintes afirmações a respeito de cálculos com porcentagem, em que x e y são valores positivos:
Ana: “x% de y é sempre igual a y% de x”.
Beto: “Um desconto de x% sobre y, seguido de um acréscimo de x% sobre o valor após o desconto, sempre resulta em y”.
Cléo: “Dar um desconto de x% sobre y sempre resulta em \( { \large (100 - x)y \over 100} " \) .
Está correto o que foi afirmado por
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Observe o produto de infinitas frações que seguem determinado padrão:
\( { \large 16 \over 2}. { \large 16 \over 4}. { \large 16 \over 8}. { \large 16 \over 16}. \ ... \ . { \large 16 \over 2^n}. \ ... \)
O produto das 16 primeiras frações desse padrão é igual a:
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Os polígonos regulares de 4, 6 e n lados, indicados na figura por P4, P6 e Pn, possuem o vértice Q em comum e, dois a dois, compartilham um lado.
Na situação descrita, n é igual a
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